Search

Copyright of Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi is the property of Revista Brasileira de Engenharia Agricola e Ambiental and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

O sucesso de projetos de reflorestamento para fins comerciais e ambientais depende, entre outros fatores, da disponibilidade de nutrientes durante a produção de mudas. Atualmente, o fertilizante de liberação controlada é muito empreendedor porque fornece mudanças de qualidade. O objetivo do estudo foi avaliar a eficiência do fertilizante Osmocote® no crescimento inicial e nutrição de mudas de Lecythis lurida . As mudas foram produzidas de sementes, coletadas de árvores matrizes nos municípios de Vitória do Xingu e Altamira, estado do Pará. A semeadura foi realizada em sacos plásticos de 1 dm 3 de capacidade, previamente preenchidos com substrato de fibra de coco acrescidos com doses de fertilizante Osmocote ® . O delineamento experimental adotado foi casualizado com único fator (dose de Osmocote ® ) distribuído em cinco doses: 0,0 (controle); 2,0; 4,0; 6,0 e 8,0 g L -1 de fertilizante Osmocote ® . Para cada tratamento foram utilizadas 20 repetições (uma planta por reprodução). Aos 120 dias após a emergência foram avaliadas as parâmetros morfológicos para determinar o crescimento das mudanças e análise nutricional das folhas. A dose de Osmocote ® que apresentou melhor resposta para as variáveis ​​morfológicas foi 6,0 g L -1 . Os macros (micronutrientes) nutrientes extraídos e exportados pela muda de Lecythis lurida em g kg -1 (mg kg -1 ) obedeceram à seguinte ordem: K>N>Mg>S>Ca>P>(Fe>Mn>Zn>B >Cu). Conclui-se que uma dose de 6,0 g L -1 de Osmocote® melhorou a nutrição e a qualidade das mudas de Lecythis lurida . O uso do fertilizante Osmocote® possibilita maior crescimento e melhor estado nutricional para as mudas de Lecythis lurida .

In Brazil semi-arid regions, excess of soluble salts is a limiting factor for the success of agricultural crops. An adequate supply of nutrients can cause positive responses in plant species under salt stress. The objective of this study was to analyze the effect of nitrogen and potassium on the morphophysiology of passion fruit (Passiflora edulis) seedlings subjected to saline stress. The design was a randomized blocks design, with treatments generated by the Box Central Composite Design matrix. Five electrical conductivities of irrigation water (ECw = 0.5, 0.98, 2.15, 3.32, and 3.80 dS m-1), five doses of nitrogen (N) and potassium (K) (0.0, 29.08, 100.0, 170.92, and 200.0%), in four replications. The combination of 200% NK stimulated the synthesis of chlorophyll a, and total chlorophyll under low salinity conditions (0.5 dS m-1). The chlorophyll a/b ratio was higher at ECw of 3.8 dS m-1 and under a concentration of 20.23% NK. The increase in water salinity from of 0.5 dS m-1 caused deleterious effects on the growth of passion fruit seedlings. The doses of NK between 100% and 120% improved the absolute growth rates of plant height and stem diameter, chlorophyll b, aerial dry matter, and total dry matter. The 200% dose of NK improved the leaf mass ratio. The combination of N and K applied foliar proved to be efficient in reducing the effects of salinity on the synthesis of photosynthetic pigments, providing better growth conditions for yellow passion fruit seedlings. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Ciências Agrárias is the property of Sociedade de Ciencias Agrarias de Portugal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

O lodo de esgoto é um subproduto do tratamento de esgoto, e seu destino é a incineração ou armazenamento em aterros sanitários, mas pode ser usado na agricultura como fertilizante. Esta pesquisa objetivou avaliar a importância do uso do lodo de esgoto como fertilizante do solo em plantios florestais de espécies madeireiras. A metodologia que se mostrou mais adequada para o desenvolvimento deste estudo foi a pesquisa bibliográfica sistemática, realizada em artigos científicos publicados entre os anos de 2013 a 2023. O uso do lodo de esgoto em plantios florestais acelera e aumenta a produção de madeira e biomassa, além de trazer benefícios nutricionais. A sua utilização como fertilizante também traz benefícios ao meio ambiente, pois evita sua deposição em aterros sanitários ou a sua incineração e fornece retorno financeiro para a empresa que trata os efluentes e para empresa florestal, já que minimiza os gastos com fertilizantes convencionais.

Controlled burns have been used to manage pastures, forests and agricultural fields for centuries. Defended by some and criticized by others, until today, there is still no consensus in the scientific community about the effects caused by fire on soil. This study had the objective to analyze the effect of controlled burns on soil pH, H+Al, Al3+, Na+, K+, P, O.M., Ca2+, Mg2+, and N. For this propose, two different pasture plots were burned and had the fire intensity quantified. The burned soil, and from an adjacent control plot, were collected at three different moments: immediately, one and six months after the burns. The burns presented low intensity ranging from 23,7 to 30,91 kJ m-1 s-1. Immediately after the burns the values of pH, Na+, Ca2+, K+ and P increased in the burned plots and were significantly different from the control plot. However, six months after the burns, only the amounts of K+, P and Ca2+ remained significantly larger than the controlled. Despite the values of the N and H+Al in burned and control areas were similar immediately and one month after the burns, after six months the amount of N was significantly larger in one of the burned plot, while the H+Al was significantly bigger in the control plot. The amounts of Mg2+, O.M. and Al3+did not change during the study period. The found results suggest that low-intensity controlled burns can reduce soil acidity and be effective in increasing some essential nutrients for plant development in short term. [ABSTRACT FROM AUTHOR]

Copyright of Silva Lusitana is the property of Unidade de Investigacao de Silvicultura e Productos Florestais and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A cafeicultura vem crescendo cada vez mais no Brasil e, diante disso, tecnologias são desenvolvidas constantemente para obtenção de maiores produtividades. Nesse contexto, vem sendo estudado o efeito do mulching de polietileno e fontes de adubo na cafeicultura. O objetivo desse trabalho foi avaliar a incidência de bicho-mineiro e ácaro-vermelho em cafeeiro em função do uso do mulching de polietileno e adubos (liberação controlada e convencional). A pesquisa foi realizada na área experimental da Universidade Federal de Uberlândia – Campus Monte Carmelo, Minas Gerais, com a cultivar de Coffea arabica IPR 100, com delineamento em blocos casualizados e quatro repetições. Foram testados os seguintes tratamentos: T1 - mulching dupla face branco/preto com adubo convencional; T2 – mulching dupla face branco/preto com adubo de liberação controlada; T3 – mulching dupla face prata/preto com adubo convencional; T4 – mulching dupla face prata/preto com adubo de liberação controlada; T5 – Sem mulching com adubo convencional; T6 – Sem mulching com adubo de liberação controlada. As avaliações ocorreram quinzenalmente de julho de 2020 a dezembro de 2020, mediante a constatação da presença ou ausência de ácaro-vermelho e de lagartas de bicho-mineiro. Os picos de densidade populacional para bicho-mineiro ocorreram no período de julho a outubro de 2020, e para ácaro-vermelho no mês de agosto, devido à baixa umidade relativa do ar e precipitação. Assim, conclui-se que a utilização do mulching dupla face prata/preto proporcionou maior atratividade do bicho-mineiro-do-cafeeiro. Já as fontes de adubo não influenciaram na probabilidade de ocorrência deste inseto-praga. Além disso, os adubos convencionais, bem como os de liberação controlada, e a ausência/presença de coberturas do solo, não influenciaram na incidência de ácaro-vermelho em cafeeiros da região do Cerrado Mineiro.

In economic terms, the carrot is the main root vegetable and it is among the ten most cultivated oilproducing species in Brazil. Current study evaluates the productivity and commercial quality of carrot roots at different levels of simple superphosphate (0, 100, 200 and 300 kg ha-1 of P2O5) and potassium chloride (0, 100, 200 and 300 kg ha-1 of K2O) applied to the surface of the flower bed and incorporated with a hoe. Design comprised randomized blocks with 4 x 4 factorial scheme and four replications. Variables analyzed were total productivity and commercial roots, diameter and length of commercial roots. There was no significant interaction (p < 0.05) between phosphorus and potassium doses for the variables evaluated. Phosphorus and potassium doses were significant only for total yield and commercial roots, and the maximum yield of commercial roots was obtained by 255.8 kg ha-1 of P2O5 (39.5 t ha-1 ) and 174.0 kg ha-1 of K2O (37.6 t ha-1 ). Productivity increase averaged 49.5% with phosphorus dose and 31.6% with higher potassium dose without fertilization. The above showed the importance of adequate management of phosphate fertilization and potassium in carrots to obtain high yields. [ABSTRACT FROM AUTHOR]

From the creation of new corn genomics to meet production demands, it is necessary to evaluate how these new cultivars react to the different environments that exist in Brazil. Front this, the objective of this study was to evaluate the effects of different levels of N and K used to topdressing fertilization on agronomic characteristics of two corn varieties at Amazon environmental conditions. The experimental design was randomized in block using a factorial scheme (2 x 4 x 4), with two corn varieties (BRS Caimbé and BR 5011 Sertanejo), four N dosages (0, 60, 100, and 140 kg.ha-1 ) and four K dosages (0, 20, 60, and 90 kg.ha-1 ). Each plot was constituted by five lines of 20 m of length and 2.40 m of width, with a space of 0.60 m among these, totalizing an area of 48 m2 per plot. Data collected were subjected to ANOVA and, subsequently, to Tukey test at 5% of significance. Caimbé corn variety presented higher (p < 0.05) number of plants, plant weight, and spikes per plot. High dosages of N and K provided high (p < 0.05) number of plants, plant weight, and spikes per plot. Caimbé corn variety presented higher (p < 0.05) spike weight and size. Other variables did not present significant (p > 0.05) results. High dosages of N provided high (p < 0.05) stem diameter and weight, leaf weight, spike size, and low spike weight. Lower levels of K caused low (p < 0.05) plant height, first spike height insertion, stem diameter, and spike weight. [ABSTRACT FROM AUTHOR]

Copyright of Nativa is the property of Revista Nativa and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The determination of nitrogen in plants by techniques that allow a fast diagnosis, based on plant growth characteristics, can be a useful tool for the nutritional management of coffee plants. Thus, this study evaluated growth and yield characteristics of irrigated conilon coffee in response to different nitrogen levels, resulting in the determination of the minimum N levels required to achieve the maximum yield, here called critical levels. The experiment was carried out in Colatina, Espirito Santo, Brazil, on plantations of conilon coffee, clonal variety Emcapa 8111, genotype 02. Six nitrogen levels were applied (0, 110, 220, 440, 880 and 1320 kg N ha-1) and the response in growth and yield characteristics periodically evaluated. There was a positive effect of the increasing N levels on yield, in that the N levels that provided 95% of the maximum yield (137.4 bags ha-1 and 108.5 bags ha-1) in the 2012/2013 and 2013/2014 growing seasons, respectively, were 420.7 and 543.1 kg N ha-1. There was also a positive effect of N levels on the growth characteristics and nitrogen contents, indicating their use as tools for a rapid nutritional diagnosis, with a view to optimizing the nitrogen management in Conilon coffee. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Ciências Agrárias is the property of Sociedade de Ciencias Agrarias de Portugal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The recovery of areas contaminated by petroleum hydrocarbons arose due to the great environmental impact resulting from accidents involving leakage during extraction, transport in pipelines, vessels and industrial units. Bioremediation is considered to be a sustainable and economically viable method for reducing or remedying contamination in the provoked environment. Among the developed techniques, biostimulation is an option to accelerate the native soil microbiota with the addition of nutrients. The experiment was conducted in sandy soil contaminated with petroleum and biostimulated with fertilizers. The objective of this work was to evaluate the biostimulation with nitrogen, phosphorus and potassium (NPK) in the degradation of hydrocarbons. Thus, the experiment was conducted for a period of 105 days evaluating the CO2 production by the respirometry method. The treatments were arranged in a randomized block, according to five petroleum doses (0, 1, 3, 5 and 10%) and five (NPK) doses equivalent to 0, 250, 500, 1250 and 2500 kg ha-1 of the 10-30-20 formulation, with three replicates. It was verified that the highest C-CO2 production was 3.539.40 mg kg-1 for the doses of 9.20% of petroleum, and 2,435 kg ha-1 for NPK. [ABSTRACT FROM AUTHOR]

The yellow passion fruit is propagated by seeds. However, farmers have demanded a technology that would produce more vigorous and higher quality seedlings for improvements in the field. Seedlings' nutrition during formation is highly important and the use of alternative products as a source of mineral nutrients would improve its formation and, at the same time, its production system for a better relationship between costs, benefits and environment. Current study evaluates the effect of hydrosoluble complex at different frequencies of application and concentrations in the growth and development of passion fruit seedlings. Passion fruit seedlings were placed in small tubes conditioned in a plastic hothouse between September and December 2013. The hydrosoluble complex was applied by manual fertigation at concentrations 0, 250, 500 and 1000 mg L-1 and at different application intervals (10, 20 and 30 days) on seedlings with or without chemical fertilization. After 90 days, height, stalk diameter, number of leaves, length of root and fresh and dry mass of the aerial part and root system, and leaf area were evaluated. Results showed that HC did not influence the formation of seedlings if applied on passion fruit seedlings cultivated in the substrate without conventional chemical fertilization. HC application on passion fruit seedlings at concentration 1000 mg L-1 for every 20 days with or without conventional chemical fertilization increases the stalk diameter, whilst the application of 250 mg L-1 of HC, regardless of frequency of application, increases root mass. [ABSTRACT FROM AUTHOR]

Ochroma pyramidale is a fast-growing species with high commercial value. The largest volumes of its wood are obtained from commercial plantations; however, there are very few studies of its production in nurseries. The objective of this study was analyse the effect of N, P, K concentration and fertilisation frequency on morpho-physiological response of O. pyramidale grown in biopots using response surface methodology. The experiment was set up using the response surface methodology for which 30 seedlings were used per experimental run. The experiment consisted of applying different concentrations of N, P, K and two fertilisation frequencies according to the optimal (Custom) design. The response variables were height increase, diameter increase and CO2 assimilation. From the results obtained, we confirmed the positive effect of N, P and K fertilisation on the variables under study. From the experimental data, a second-order quadratic polynomial model was found that allows the prediction of the morphophysiological response of the species. The frequency of fertilisation during the time interval studied was not significant. [ABSTRACT FROM AUTHOR]

Copyright of Texto & Contexto Enfermagem is the property of Universidade Federal de Santa Catarina, Programa de Pos-Graduacao de Enfermagem and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study aimed to evaluate the effect of organic and inorganic fertilizers on the pitaya's Hylocereus undatus performance under field conditions. The experimental design used was Completely Randomized Block Design (CRBD). Five treatments consisting of the four different fertilizer dosages were included in this study, namely T1 (00-120-320-120); T2 (04-080-160-080); T3 (06-060-100-060); T4 (08-000-000-000) and T5 (Control: 00-000-000-000) of bovine manure (kg pit-1), urea (g pit-1), super simple (g pit-1) and potassium chloride (g pit-1), respectively. Parameters such as height, number, length, width, area, and volume of the cladodes were assessed at 20 and 320 days after planting. The number of fruits produced and mineral composition (N, K, Ca, Mg, P, and S) of H. undatus plants were also assessed. The results on morphometric characteristics of the cladodes, macronutrient composition and fruit yield have been recorded with higher values in treatments 3 and 4. However, according to the principal component analysis performed, treatment 3 was the one that correlated with the evaluated characteristics. The results have clearly indicated the importance of combination of adequate dose of mineral and organic fertilizer for better vegetative performance and yield of pitaya crop. [ABSTRACT FROM AUTHOR]

Copyright of Ciência Florestal (01039954) is the property of Ciencia Florestal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Cowpea (Vignaunguiculata (L.) Walp.) is one of the most important and strategic food sources for the tropical and subtropical regions of the planet. Most of the Brazilian production of cowpea in the North and Northeast regions is made in consortia with other crops, such as cassava and corn, in addition to perennial crops. The objective of this work was to evaluate the vegetative growth of cowpea under different sources of organic fertilization and relate it to chemical fertilization. The experiment was carried out in a greenhouse located at the Instituto de Ciências Agrárias, area of soil science, Federal Rural University of Amazônia – UFRA, in the municipality of Belém, Pará. The soil used in the experiment was collected in the layer from 0 to 20 cm, in an area ofsecondary forest with more than 20 years without agricultural activities, within the university area. The soil was incubated for a period of 30 days to reduce acidity, using dolomitic limestone. After the reaction of limestone in the soil, 3 seeds were introduced per pot, with a capacity for 3 dm³ of soil, of the pretinho variety. The beginning of germination occurred on the third day after sowing, and on the tenth day, the thinning was done, leaving only one plant per pot. The design used in the experiment was completely randomized distributed in 5 replications, with the following treatments: soil + chemical fertilization; soil + chemical fertilization + limestone; soil + sheep dung; soil + organic compost; soil + poultry litter; soil + chemical fertilization + sheep manure; soil + chemical fertilization + poultry litter; soil + chemical fertilization + organic compost; soil + limestone. Distributed on two benches and totaling 45 experimental units. The stem height, stem diameter, number of leaves, shoot green mass, shoot dry mass, branch green mass, branch dry mass, root green mass, and the dry mass of the roots. Of the variables analyzed, the treatments with chemical fertilization plus sheep manure obtained the best results, followed by fertilization with organic compost and fertilization with poultry litter. Fertilization, according to the concentrations used, have positive effects on the vegetative part of the cowpea crop. [ABSTRACT FROM AUTHOR]

O trabalho foi realizado com objetivo de avaliar a produtividade, a composição morfológica e bromatológica, bem como a taxa de desaparecimento ruminal da matéria seca (MS) da silagem de milho (Zea mays) cultivado sob níveis crescentes de adubação nitrogenada em cobertura. Na semeadura do milho foi aplicado diretamente no sulco de plantio 500 kg ha-1 de adubo com a formulação 12-31-17 (NPK) para todos os tratamentos, e em estágio fenológico V5 foi realizada a adubação em cobertura diferenciada, utilizando as seguintes dosagens: T1, 135,0 kg de N ha-1 (NPK: 27-00-00); T2, 175,5 kg de N ha-1 (NPK: 27-00-00); e T3, 225,5 kg de N ha-1 (NPK: 27-00-00). O aumento da dose de adubação nitrogenada em cobertura proporcionou um menor número de folhas secas no momento da colheita. Além disso, a maior dose de nitrogênio lançada em cobertura (225,5 kg ha-1) proporcionou uma fração fibrosa de maior digestibilidade em relação aos demais tratamentos (73,29%). A dose de 175,5 kg de N ha-1 proporcionou plantas com melhor taxa de degradabilidade ruminal (0,99% hora-1) e quilos de matéria seca digestíveis por área (15081 kg MS ha-1), enquanto a menor dose utilizada (135,0 kg ha-1) gerou os melhores níveis de FDN (55,76%), FDA (25,75%) e CNF+EE (34,66%) sem afetar a produtividade e a composição morfológica da planta. Os resultados do presente trabalho implicam dizer que a cultura do milho responde de maneira diferente conforme o aumento dos níveis de nitrogênio utilizado em cobertura, onde, cada nível traz benefícios distintos em relação a qualidade bromatológica.

Foliar fertilization aims to provide rapid-absorption nutrients to the plant, supplement soil fertilization, and fulfill the uptake peaks' demand. This study's objective was to verify the effect of foliar fertilizers application in stages R2 (full bloom) and R5 (beginning seed) on soybean grain quality, yield components, and grain yield. The experiment was conducted in three sites through Parana state (Brazil) in a 9 × 2 factorial design, with three replications per treatment. Total chlorophyll index, plant height, yield components (number of pods per plant, number of grains per pod, number of grains per plant and thousand-grain mass), protein and oil concentration in the grain, and final yield were evaluated. Plant height, total chlorophyll index, and grain quality were not affected by this study's foliar fertilizers. Thousand-grain mass responded to the foliar products and the application times. However, no final grain yield effect was observed, possibly because those nutrients' soil level was adequate. [ABSTRACT FROM AUTHOR]

The research was carried out in La Sultana and El Madroño of the municipalities of Timbio and El Tambo respectively, in order to evaluate the effect of mineralized liquid organic fertilizer on mulberry cultivation in order to analyze production costs, improve yield and make an environment friendly agriculture. In La Sultana the evaluation was carried out in the first cut and in El Madroño in the third cut. A randomized complete block design with seven treatments and three repetitions was used on both farms. The mulberry, in the two farms, was fertilized five times according to the treatment with alternate edaphic / foliar applications every fifteen days; plant height, biomass, leaf weight, weight of stems, weight ratio of leaves / weight stems, leaf yield and nutritional quality of the leaves were evaluated, variance analysis and Duncan averages comparison test (P=0,005): in La Sultana there was no statistically significant difference between treatments, the best treatment was the application of ALOFA 5%, while in El Madroño the treatments did show statistically significant difference in the evaluated variables and the best treatment was inoculation with MI and A.L.O.F.A. at 5%. [ABSTRACT FROM AUTHOR]

The effect of application of mineral fertilization and increasing doses of biofertilizers obtained from the anaerobic digestion of cassava wastewater in the development of soybean plants is evaluated. Assay was conducted in a protected environment at the Universidade Federal do Paraná (UFPR), campus Palotina, between October 2015 and March 2016. Totally randomized design comprised six treatments composed of the following doses and applied in five replications: mineral fertilization 02-20-20 (NPK) and 0, 40, 80, 120 and 160 kg ha-1 of K2O. The following parameters were evaluated: height, Falker Chorophyll Index (FCI), stalk diameter, number of ramifications, dry mass of aerial and root sections, number and mass of grains and oil rate. Mineral fertilization was greater than organic fertilization of FCI and stalk diameter. At the end of the cycle, difference existed only in the number of grains, with higher rate in dose 160 kg ha-1 of K2O. Oil rate in grains was lower in mineral fertilization and lower doses of K2O, suggesting that higher doses provided a positive effect. Biofertilizer of anaerobic digestion of cassava wastewater may be coupled to mineral fertilization for costs reduction and the correct use of the waste. [ABSTRACT FROM AUTHOR]

Organomineral fertilizers are the combination and/or mixture of organic fertilizers with mineral fertilizers. This combination provides the necessary nutrients for the development of the crops, being the organic matter, an enhancer of these minerals, besides an aggregator in the improvement of the physical, chemical and biological properties of the soil. The objective of this work was to highlight the potential, production and benefits of using organominerals in crops, such as: lettuce, arugula, tomatoes, soybeans, coffee, corn, cowpea, potatoes, sugar cane, eucalyptus, wheat and sesame. It is noteworthy that numerous studies prove the effectiveness of these fertilizers in crops, aiming at numerous agronomic parameters. In addition to the environmental liability, it can generate a lot of revenue with this product with growth potential in the world agricultural market. [ABSTRACT FROM AUTHOR]

Copyright of Revista Brasileira de Reprodução Animal is the property of Revista Brasileira de Reproducao Animal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper aims to assess the contribution of basal and aerial tillers to structural and productive characteristics of Tifton 85 bermudagrass, irrigated with fish tank wastewaters and fertilized with NPK. The experiment was conducted in the city of Petrolina-PE, Northeastern Brazil. The evaluated area had 960 m2 subdivided into five treatments and ten replicates, in a completely randomized design. Treatments consisted of different fertilization rates of NPK (0, 33, 67, 100, and 150%) as recommended by the Handbook of Fertilization Recommendations for the State of Pernambuco, and based on a prior soil analysis. Irrigation water came from fishponds with Nile Tilapia fingerlings. The experiment was divided into four intervals of 27, 29, 18, and 21 days respective to the first, second, third, and fourth cuts. Both tiller types were analyzed for number of individuals, culm length and diameter, fully- and partially-expanded leaves, leaf length and width (fully or partially expanded), dry mass of leaves (fully and partially expanded and total), culm, dead tissue, and total tiller, and the ratio of leaf and culm. Both structural and productive characteristics showed a linear growth trend for both types, with emphasis on the basal tillers. Thus, a suitable supply of nutrients is crucial for grasses, mainly NPK, as these are macronutrients of vital importance in physiological processes. In addition to the nutrients supplied via fish farming wastewater, fertilization with 150% of the recommended amount of NPK promoted a greater structural development of the tillers, increasing their productivity levels.

No ambiente altamente competitivo que as empresas se encontram, atentar para a satisfação do cliente torna-se cada vez mais importante. O objetivo deste trabalho é criar um modelo de avaliação da satisfação do cliente aplicada a Empresa de fertilizantes agrícolas TIMAC Agro Brasil. Para atingir o objetivo foi feito um levantamento sobre as metodologias utilizadas nesse intuito e foram desenvolvidas variáveis relacionadas à satisfação do cliente, adaptadas ao meio rural e a cultura da soja. Através de análise fatorial e testes de confiabilidade interna, chegou-se a um modelo composto por um construto e cinco subconstrutos relacionados com satisfação do cliente.

Na atualidade é notável a evidente preocupação com nosso sistema produtivo em atender as premissas do desenvolvimento sustentável, atentando para o cumprimento dos pilares que o fundamentam sendo eles de cunho econômico, social e ambiental. Os fertilizantes organominerais são uma boa alternativa, sendo composto basicamente de uma mistura de fertilizantes minerais e orgânicos, que apresentam potencial de uso agrícola, pois tendem a ter um menor custo em relação aos fertilizantes químicos, e advém de resíduos de outros sistemas produtivos como por exemplo a cama de frango, viabilizando investimentos em seu uso e pesquisa muito por atender os ideais de conscientização crescente de uma produção, manejo e desenvolvimento rural sustentável. A utilização da matéria orgânica permite que se tenha uma racionalização do adubo mineral, promovendo um aumento da capacidade de troca catiônica (T), reduzindo perdas por lixiviação e auxiliando na liberação dos nutrientes a planta, contribuindo para elevar a produtividade. Objetivou-se com este trabalho verificar parâmetros de produtividade em relação ao comportamento da utilização da adubação estritamente química e convencional contrapondo-se a adubação organomineral, visando desenvolvimento sustentável, fornecimento, solubilização e efeito residual de nutrientes no solo, reutilização de subprodutos e custos de produção.

O percolado de aterro sanitário é um líquido produzido a partir de processos físicos, químicos e biológicos aos quais os resíduos sólidos urbanos são submetidos nos aterros sanitários. Apresenta uma composição físico-química variável e pode conter altos teores de nutrientes, sendo assim empregado na fertilização de plantas. Por isso, objetivou-se avaliar o crescimento de plantas de girassol irrigadas com água de moderada salinidade e com suplementação nutricional com percolado de aterro sanitário. O experimento foi conduzido em área experimental com cobertura de nylon (sombrite), sob delineamento inteiramente casualizado em um fatorial 4 x 2, sendo [1: 100% de areia de granulometria fina - NBR 6502; 2: areia + adubo/fertilizante orgânico misto (mistura de bagaço de cana, esterco bovino, esterco de galinha, serragem de madeira e gesso agrícola) e 80 kg de N ha-1, 3: areia + percolado de aterro sanitário e 80 kg de N ha-1; e 4: areia + percolado de aterro sanitário e 160 kg de N ha-1] e duas concentrações salinas da água de irrigação [irrigação com água destilada ou solução de NaCl a 60 mM], com 10 repetições, em vasos de 12 L. Foram realizadas análises de crescimento (altura, diâmetro do coleto, número de folhas), teores relativos de clorofila e diâmetro dos capítulos. Nas condições experimentais empregadas, substrato arenoso, as concentrações de percolado de aterro sanitário utilizadas promoveram incrementos em todas as variáveis de crescimento analisadas nas plântulas de girassol, especialmente a 80 Kg N ha-1. A irrigação com solução de NaCl a 60 mM não ocasionou efeitos negativos nas variáveis de crescimento, demonstrando assim a tolerância moderada das plantas de girassol à salinidade em substrato arenoso.

Copyright of Revista Brasileira de Reprodução Animal is the property of Revista Brasileira de Reproducao Animal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The competence of oocytes to develop to an advanced embryonic stage is dependent on the transformations that occur during oocyte maturation. In bovines, oocyte maturation begins in the phase that precedes ovulation and it is characterized by a series of morphological, molecular, and biochemical changes in the oocyte and somatic cells that surround it. These changes prepare the oocyte for fertilization and subsequent embryonic development. This review focuses on the basic principles in the nuclear and cytoplasmic maturation of oocytes through which they acquire meiotic competence and the ability for subsequent embryonic development. A competência de desenvolvimento do oócito há estádio embrionário avançado é dependente das transformações ocorridas durante a maturação oocitária. Em bovino a maturação oocitária in vivo inicia-se na fase que precede a ovulação e é caracterizada por uma série de mudanças morfológicas, moleculares e bioquímicas no oócito e nas células somáticas que o envolvem. Estas mudanças vão tornar o oócito apto a ser fecundado e ter um desenvolvimento embrionário subsequente. Esta revisão enfoca os princípios básicos da maturação nuclear e citoplasmática de oócitos, através dos quais eles adquirem competência meiótica e capacidade para o subsequente desenvolvimento embrionário. [ABSTRACT FROM AUTHOR]

This research was carried out in the municipality of Bolívar - Cauca, El Tambo district, Los Milagros municipality, located at 2589 m above sea level, where the behavior of Cauca white was evaluated under 3 levels of fertilization, with 3 planting densities and 3 planting methods, under a design of subdivided plots with 3 replications and the ecotype PROCAUCA 016 with 2 planting densities and 2 levels of fertilization in a completely randomized design with 3 replications. The response variables were the phenological phases and the yield components. For the preparation of the land minimum tillage was used, the useful plot was constituted by the 3 central furrows taking 4 effective m, leaving 50 cm of head on each side and the 2 lateral furrows as edges, the treatments were determined based on analysis of soil and the experience of researchers in crop management. The productive cycle was between 116,2 and 168,6 days showing the precocity of PROCAUCA 016, in terms of yield for Blanca del Cauca, the best results were obtained with transplanting plants from sowing in commercial tray, density trickle with control fertilization and with PROCAUCA 016 the best results were obtained with sowing with trickle and ideal fertilization. [ABSTRACT FROM AUTHOR]

Copyright of Engenharia na Agricultura is the property of Engenharia na Agricultura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Landfill percolate is a liquid produced from physical, chemical and biological processes to which municipal solid waste is subjected to landfills. It has a variable physicochemical composition and may contain high levels of nutrients, thus being used in plant fertilization. Therefore, the aim of this work was to evaluate the growth of sunflower plants irrigated with water of moderate salinity and with nutritional supplementation with landfill percolate. The experiment was carried out in experimental area under a completely randomized design in a 4 x 2 factorial design (1: 100% fine grained sand - NBR 6502; 2: sand + mixed organic fertilizer (sugarcane bagasse mix, cattle manure, chicken manure, wood sawdust and agricultural plaster) and fertilizer 80 kg N ha-1, 3: sand + landfill percolate 80 kg N ha-1, and 4: sand + landfill percolate 160 kg N ha-1) and two saline concentrations of irrigation (distilled water or 60 mM NaCl solution), with 10 repetitions in 12 L pots. Growth analyzes (height, stem diameter, leaf number), relative chlorophyll content and chapter diameter were performed. Under the experimental conditions employed, sandy substrate, landfill percolate concentrations used promoted increases in all growth variables analyzed in sunflower seedlings, especially at 80 Kg N ha-1. Irrigation with 60 mM NaCl solution did not cause negative effects on growth variables, thus demonstrating the moderate tolerance of sunflower plants to salinity in sandy substrate. [ABSTRACT FROM AUTHOR]

The evaluation of litterfall and nutrient return is important for understanding the dynamics of nutrient cycling. Although required in smaller quantities by plants, micronutrients have unique importance in biogeochemical regulation. The objective of the present study was to quantify the litterfall and the concentration of micronutrients in the different fractions and seasons of the year in Eucalyptus dunnii stand. Four plots of 20 m x 21 m were demarcated. The collection of leaf litter, twigs (diameter <0.5 cm) and miscellaneous resulted in the installation of 4 collectors with an area of 0.5 m² in each plot. For the quantification of the thick branches fraction (diameter> 0.5 cm), four useful areas of medium-diameter trees were demarcated in each plot. The leaf fraction represented 59% of litterfall and the transfer order was Mn> Fe> B> Zn> Cu, totaling 8.04 kg ha-1. The leaf fraction presented the highest concentrations for B and Mn. The litterfall was seasonal with summer and spring differing statistically from winter and the temperature variable explains the deposition pattern of the same. [ABSTRACT FROM AUTHOR]

Copyright of Revista Ciência Agronômica is the property of Revista Ciencia Agronomica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engenharia na Agricultura is the property of Engenharia na Agricultura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Academia & Derecho is the property of Universidad Libre - Seccional Cucuta and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Resumo: O objetivo deste trabalho foi determinar a dose ótima de K e seu efeito residual sobre a produtividade máxima e a qualidade de tubérculos de batata (Solanum tuberosum). O experimento 1 foi realizado em solo com baixo teor de K (38 mg dm-3), em delineamento experimental de blocos ao acaso, com quatro repetições, cujos tratamentos constituíram-se de cinco doses de K - 0, 110, 220, 440 e 880 kg ha-1 de K2O -, na forma de KCl, aplicados em pré-plantio ao sulco. O experimento 2 foi realizado no mesmo local, com o teor residual do fertilizante aplicado no experimento 1. A fertilização potássica e seu efeito residual influenciaram significativamente o número, a produtividade e a matéria seca dos tubérculos. No entanto, altas doses de K reduziram o teor de matéria seca e a gravidade específica dos tubérculos. O teor residual de K não influenciou todos os componentes de produtividade. A dose de máxima eficiência econômica foi 393,5 kg ha-1 de K2O, que propiciou a máxima produtividade de tubérculos comerciais de 36,2 Mg ha-1, no experimento 1, e de 19,6 Mg ha-1, no experimento 2.

ABSTRACT The macaw palm [Acrocomia aculeata (Jacq.) Lood. ex Mart] has been domesticated to subsidize biodiesel production programs in Brazil. However, little is known about the seedling production of this species. This study aimed to evaluate substrate mixtures, limestone and phosphorus rates for substrate amendment and topdressing frequency in macaw palm seedlings. Three trials were conducted in a greenhouse up to six months of nursery cultivation. Trial 1: determination of percent mineral and organic fractions of seven substrate mixtures. Trial 2: evaluation of four limerates for soil amendment versus four phosphorus rates. Trial 3: evaluation of N, K and Mg topdressing frequency. Significant differences were found in the three trials for most of the variables (plant height, leaf number, shoot dry mass, root dry mass, vigor and bulb diameter). The main results obtained were as follow: Trial1 - the best seedling growth was observed in substrates with at least 25% organic matter. Trial2 -lime rates ranging from 0.50 to 1.25 kg associated with 3 to 4 kg of single superphosphate per m3 of substrate provided the best seedling growth. Trial 3 - topdressing fertilization provided better development of seedlings regardless of frequency.

RESUMO O manjericão (Ocimum basilicum L.) atualmente encontra-se distribuído por todos os continentes e foi introduzido no Brasil com a chegada da colonização italiana. As principais partes utilizadas para comercialização no Brasil são as folhas frescas ou secas. O presente trabalho teve como objetivo avaliar o efeito de doses da adubação nitrogenada, durante o cultivo na primavera e outono, nas características produtivas e na produtividade de manjericão, Alfavaca basilicão vermelho, em casa de vegetação. O delineamento utilizado foi em blocos casualizados, em esquema fatorial 6 x 2, com cinco repetições, onde o primeiro fator foi constituído de cinco doses de nitrogênio e uma testemunha (0,0; 45,0; 90,0; 135,0; 180,0 e 225,0 kg ha-1 de nitrogênio) e o segundo, pelas épocas de cultivo (primavera e outono). Para as características produtivas da cultivar de manjericão Alfavaca Basilicão vermelho, verificou-se que as doses de nitrogênio entre 90,0 a 135,0 kg ha-1 foram mais adequadas, elevando todas as características produtivas avaliadas, do cultivo de primavera. Quando observado o cultivo no outono, teve-se ajuste apenas para a projeção de copa, massa fresca de parte aérea e área foliar. Quando se obteve ajuste significativo, a dose de aproximadamente 110,0 kg ha-1 de nitrogênio foi a que promoveu maior desenvolvimento da cultura. Em relação às épocas de cultivo na primavera recomenda-se o uso de adubação mineral nitrogenada, porém quando esse cultivo é realizado outono, a adubação nitrogenada não é responsiva.

RESUMO As gramas halófitas Spartina alterniflora e Spartina densiflora são espécies bioengenheiras, que podem ser utilizadas para mitigação de áreas degradadas de marismas e manguezais, para o controle da erosão costeira e para estabilização de dragado depositado em regiões estuarinas e costeiras. O objetivo deste trabalho foi avaliar os efeitos da densidade de plantio e da adubação com nitrogênio (N) e fósforo (P) sobre mudas de propagação vegetativa destas duas espécies, crescendo em bandejas (0,15 m2; 7500 cm3). Para isto, foram realizados em estufa agrícola, não climatizada, dois experimentos nos anos de 2009 e 2011. Em 2009, apenas S. alterniflora foi cultivada, em duas densidades de plantios (133 e 400 mudas m-2) e com dois níveis de adição de nutrientes (sem adubação e com adição total de 50,8 gN m-2 e 16 gP m-2). Em 2011, bandejas com 80 mudas m-2 de ambas as espécies foram adubadas com razões 2N:1P, 6N:1P, 10N:1P e 14N:1P (adição total de 115 gN m-2). A adubação com NP estimulou a formação foliar e, em recipientes fertilizados, o número médio de hastes de S. alterniflora, após 80 dias, foi o dobro do observado nos recipientes-controle. Entretanto, densidades iniciais de 400 ou mais hastes m-2 nas bandejas resultaram em alongamento vertical excessivo das hastes de S. alterniflora (cerca de 100 cm de altura), o que prejudica o manuseio e o plantio. A adubação com razão 2N:1P resultou em melhor perfilhamento de ambas as espécies.

RESUMO O Vale do São Francisco constitui o maior produtor nacional de manga em regime irrigado. Na mangueira, além da produtividade, o boro é o nutriente que mais afeta a qualidade dos frutos, e sua deficiência pode provocar distúrbios fisiológicos. Nesse sentido, um experimento foi desenvolvido com o objetivo de avaliar a associação do boro com a incidência de frutos de manga Palmer acometidos com desordem fisiológica e seu efeito na produtividade de frutos. Os tratamentos consistiram em sete diferentes manejos de adubação: T1 = Duas fertirrigações com 50 g planta-1 de H3BO3 (adubação do produtor); T2 = T1 + cinco pulverizações com H3BO3 [duas primeiras (0,3%) e demais (0,2%)]; T3 = T1 + cinco pulverizações com H3BO3 [duas primeiras (0,3%) e demais (0,4%)]; T4 = T1 + cinco pulverizações com H3BO3 [duas primeiras (0,3%) e demais (0,6%)]; T5 = T1 + duas pulverizações com H3BO3 (0,3%) + três fertirrigações (10 g planta-1 de H3BO3); T6 = T1 + duas pulverizações com H3BO3 (0,3%) + três fertirrigações (20 g planta-1 de H3BO3); T7 = T1 + duas pulverizações com H3BO3 (0,3%) + três fertirrigações (40 g planta-1 de H3BO3). Os resultados demonstram que há evidências de que a deficiência de boro pode provocar a emissão de frutos acometidos por desordem fisiológica e de que o manejo da adubação boratada é eficiente na redução desse problema e, ainda, influencia a produtividade de manga Palmer, destacando-se que o T2 atingiu produtividade média de 35,62 t ha-1, embora mais estudos sejam necessários para a recomendação de um sistema de manejo adequado para a cultura.