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The success of reforestation projects for commercial and environmental purposes depends, among other factors, on the availability of nutrients during seedling production. Controlled-release fertilizer is widely used because it provides shorter seedling formation time with less loss of nutrients through leaching. The objective of the study was to evaluate the efficiency of Osmocote® fertilizer in the initial growth and nutrition of Lecythis lurida seedlings. The seedlings were produced from seeds collected from mother trees in the municipalities of Vitória do Xingu and Altamira, State of Pará. Sowing was carried out in plastic bags with a capacity of 1 dm3, filled with coconut fiber substrate plus dded with doses of Osmocote® fertilizer. The experimental design adopted was completely randomized with a single factor (dose of Osmocote®) distributed into five doses: 0.0 (control); 2.0; 4.0; 6.0 and 8.0 g L-1 of Osmocote® fertilizer. For each treatment, 20 replications were used. At 120 days after emergence, morphological parameters were evaluated to determine the growth of the seedling and nutritional analysis of the leaves. The dose of Osmocote® that provided the best response to morphological variables was 6.0 g L-1. The average content of macro and micronutrients extracted and exported in each treatment by the Lecythis lurida seedling obeyed the following order: K>N>Mg>S>Ca>P>Fe>Mn>Zn>B>Cu. It is concluded that dose 6.0 g L-1 of Osmocote® improved the nutrition and quality of Lecythis lurida seedlings. The use of Osmocote® fertilizer allows greater growth and better nutritional status for Lecythis lurida seedlings. [ABSTRACT FROM AUTHOR]

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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 .

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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.)

Butia eriospatha (Martius ex Drude) Beccari é uma palmeira endêmica da região sul do Brasil, de valor econômico e cultural. Atualmente, a espécie está classificada como ameaçada de extinção, devido à expansão agrícola, urbanização e dificuldades de propagação da espécie. O objetivo deste trabalho foi de avaliar o efeito de fertilizantes NPK no crescimento inicial de mudas transplantadas de B. eriospatha. As mudas foram obtidas de área de regeneração natural no município de Curitibanos (SC), e transplantadas para vasos de 2,6 L contendo substrato comercial Carolina Soil®. O experimento foi conduzido em casa de vegetação, em delineamento inteiramente casualizado. Para a análise do efeito dos fertilizantes, foram utilizados sete tratamentos, sendo eles a aplicação de nitrogênio (N), fósforo (P), potássio (K), nitrogênio, fósforo e potássio (NPK), fósforo e nitrogênio (PN), nitrogênio e potássio (NK) e fósforo e potássio (PK), contendo 20 repetições cada e totalizando 140 plântulas. Os fertilizantes utilizados no experimento foram ureia, superfosfato triplo e cloreto de potássio, aplicados em períodos quinzenais. A cada bimestre foi avaliado o diâmetro de colo e altura de estipe, durante 22 meses. O melhor tratamento para o crescimento biométrico de mudas de B. eriospatha transplantadas para substrato comercial Carolina Soil® foi a associação de fósforo e nitrogênio.

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RESUMO Com o objetivo de se verificar uma possível relação entre: atividade biológica de Vernonia scorpioides, planta medicinal de potente atividade antifúngica, e níveis de alguns elementos nutricionais, foram realizadas dosagens de N-amino, N- total, potássio e fósforo em raízes, caules e folhas através de processos analíticos clássicos. Nas raízes, onde é obtido o extrato mais ativo, foram encontrados os menores teores de nutrientes, sugerindo uma relação inversamente proporcional a atividade antifúngica para ela descrita.

O conhecimento sobre o uso de remineralizadores do solo, constituídos por farelos ou pós de rochas silicatadas, vem sendo intensamente demandado por meio de editais de pesquisas e pelas cadeias produtivas da agricultura. O potencial de uso dos remineralizadores associados a compostos orgânicos (CO) é uma das principais demandas de estudo. Considerando que no Vale do Itajaí em Santa Catarina o pó de varvito (PV) e os compostos de resíduos de agroindústrias são encontrados abundantemente, tornam-se necessários estudos com a associação destes materiais. Assim, o objetivo do trabalho foi avaliar no solo o efeito da mistura do CO e PV na mineralização do N e na disponibilidade de macronutrientes. O experimento foi realizado em incubação controlada onde foram misturadas no solo, cinco doses do PV (0, 5, 10, 20 e 40Mg ha-1) ao CO (30Mg ha-1), além do tratamento somente com o solo. A adição do pó do PV em doses acima 5Mg ha-1 afeta a mineralização de N do CO, reduzindo a amonificação, intensificando a nitrificação e ocasionando menores teores de N mineral total no solo no decorrer da incubação. Os outros macronutrientes avaliados não sofreram alterações, indicando a ausência de contribuição do PV nesses atributos.

A maioria dos cultivos de importância agrícola tem mostrado respostas a aplicação de boro (B), em diferentes regiões e ambientes de produção do Brasil, certamente como resposta às baixas reservas deste nutriente nos solos. Objetivou-se com o estudo avaliar os efeitos de doses de boro sobre os aspectos nutricionais e produtivos da cultura da soja. O experimento foi conduzido na safra 2022/2023 no município de Santa Carmem – MT em Latossolo Vermelho-Amarelo, de textura argilosa. Utilizaram-se seis tratamentos com quatro repetições, dispostos em blocos ao acaso. Os tratamentos consistiram em 0,0; 0,5; 1,0; 1,5; 2,0 e 3,0 kg ha-1 de B, foi utilizado o tetraborato de sódio pentahidratado como fonte fertilizante. A aplicação de 2,0kg ha-1 de B propiciou maior produtividade de soja cujo percentual de incremento foi de 10,6% em comparação ao tratamento controle (acréscimo de 8,3 sacos ha-1). Este resultado certamente está associado ao baixo teor de B no solo e ao favorecimento do pegamento de flores após o seu fornecimento.

Sugarcane is a grass characterized by high yields and stands out as one of the main crops planted in Brazil, so there is a need to fertilize plants to optimize production, mainly of macro and micronutrients, so the objective was to evaluate the response of foliar fertilization with doses of micronutrients, in two cycles of the genotype (RB92579) in the cultivation of sugarcane under dry conditions in Brejo Paraibano. The research was conducted at the Chã de Jardim experimental farm from 2019 to 2021, in the municipality of Areia, PB. The experimental design adopted was randomized blocks, consisting of seven treatments with four replications: T1- Control (No application), T2-100, T3-180 and T4-240 days after planting (DAP) with single doses and treatments T5-100/180, T6-100/240, T7-180/240 DAP with fractional application, evaluating plant height, number of plants per linear meter, stalk diameter, number of internodes, tons of stalks per hectare and soluble solids content. The data was submitted to analysis of variance and the Scott-Knott test (p<0.05). The results obtained showed that ratoon cane was superior to plant cane in most of the variables studied, which can be explained by the fact that ratoon cane is at a higher physiological age, treatment T5 was the best for tons of stalks per hectare in both application periods, while the other variables studied were better than the control treatment. It can be concluded that foliar fertilization for sugarcane showed better results for ratoon cane, where fractional doses were more efficient. [ABSTRACT FROM AUTHOR]

Salt stress is one of the main abiotic stresses that negatively affect agricultural production and sustainable development worldwide. Thus, there is a search for management strategies to reduce the deleterious effects of salts on plants. In view of the above, the objective was to evaluate the effects of irrigation with brackish water and different forms of organomineral fertilization on the agronomic performance of the peanut crop. The study was conducted in a greenhouse in a completely randomized design (5 × 2 factorial scheme) with five forms of fertilization (F1 = 100% mineral; F2 = 100% bovine biofertilizer; F3 = 100% vegetal ash; F4 = 50% mineral + 50% bovine biofertilizer; and F5 = 50% mineral + 50% vegetal ash), two levels of electrical conductivity of the irrigation water (ECw) (1.0 and 5.0 dS m-1), and five replicates. The fertilization composed only by vegetable ash 100% associated with irrigation water with higher concentration of salts (5.0 dS m-1) caused negative effects on the number of pods, pod mass, pod shell dry mass and yield. Although brackish water (5.0 dS m-1) reduces peanut yield components and productivity, fertilization made with 100% biofertilizer provided the highest productivity among all treatments. [ABSTRACT FROM AUTHOR]

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The paricá (Schizolobium parahyba var. amazonicum) is an important native Brazilian species that has characteristics such as fast growth, high timber potential and use in reforestation projects. The aims of study was to evaluate the application of nitrogen, phosphorus and potassium on initial development of seedlings of paricá. The experiment was carried out in nursery of Universidade Federal Rural da Amazônia, Parauapebas city, Brazil, adopting a completely randomized design, an 8 x 3 factorial scheme, the treatments were: TC: control, substrate only; TN: N fertilization; TP: P fertilization; TK: K fertilization; TNP: NP fertilization; TNK: NK fertilization; TPK: PK fertilization; TNPK: NPK fertilization; in three substrates (two agricultural soils and one native forest soil), with 10 replications. The evaluations of seedlings were carried out at 90 days after sowing, verifying that TNP treatment provided higher values for biometric attributes of seedlings, with values of 59.30 cm for height of aerial part; 8.90 mm for stem diameter; 8.90 g for shoot dry mass; 3.08 g for root dry mass; and Dickson quality index of 0.78. In initial phase of seedling development there was no influence for fertilization with K alone, while application of N with P promoted the highest initial development of seedlings. [ABSTRACT FROM AUTHOR]

Dinizia excelsa é uma das maiores árvores da floresta amazônica, com grande potencial econômico para recuperação de áreas degradadas. Trata-se de uma espécie-chave para diversidade e aumento da biomassa florestal. Ainda são escassos os estudos relacionados à produção seminal de mudas da espécie. Nós avaliamos a produção e a qualidade de mudas de D. excelsa em resposta à aplicação de doses de adubo de liberação controlada. O delineamento adotado foi inteiramente casualizado, aplicando-se diferentes doses de Osmocote® (T1=0; T2=4.1; T3= 8.2 e T4=12.3 g.dm-³) com quatro repetições, utilizando-se como substrato vermiculita e fibra de coco (1:1 v/v). Foram avaliados número de folhas e folíolos, comprimento da parte aérea e raiz, diâmetro do coleto, altura das mudas, relação comprimento da parte aérea e diâmetro do coleto, área foliar, massa seca da parte aérea, raiz e total. Os dados foram submetidos à análise de variância e regressão. As mudas responderam positivamente ao uso do adubo Osmocote® e a partir da dose 4.1 g.dm-³ o acúmulo de biomassa apresentou melhores resultados, podendo ser recomendada, permitindo uma economia nos custos de produção seminal de mudas da espécie.

A tarumarana (Buchenavia tomentosa Eichler) é uma espécie nativa do cerrado brasileiro reconhecida por seu potencial na recomposição da vegetação. No entanto, para esta recomposição existe a necessidade de produzir mudas de qualidade e um dos fatores que interfere nessa qualidade é a nutrição da planta. Diante disso, o objetivo deste estudo foi avaliar o efeito da calagem para obter níveis de saturação por bases (V%), combinados ou não com diferentes doses de fósforo (P), no crescimento inicial das mudas de tarumarana. O experimento foi realizado em delineamento inteiramente casualizado com nove tratamentos e cinco repetições, sendo: T0 – 100% solo; T1 – V50%; T2 – V60%; T3 – V50% + 50 kg ha-1 de P2O5 (11 mg dm-3 de P); T4 – V50% + 100 kg ha-1 de P2O5 (22 mg dm-3 de P); T5 – V50% + 150 kg ha-1 de P2O5 (33 mg dm-3 de P); T6 – V60% + 50 kg ha-1 de P2O5; T7 – V60% + 100 kg ha-1 de P2O5; T8 – V60% + 150 kg ha-1 de P2O5. Para caracterizar o crescimento das mudas de tarumarana foram avaliadas as características morfológicas e os teores de N ao final de 90 dias. A saturação por bases e a adubação fosfatada influenciaram no crescimento das mudas de tarumarana, recomendando-se 50% de saturação e 100 kg ha-1 de P2O5, para a obtenção de mudas com maior qualidade.

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O Brasil tem enfrentado sérios problemas com o abastecimento de fertilizantes potássicos nos últimos anos. Isso tem causado a elevação dos preços e até mesmo escassez do principal fertilizante potássico utilizado pelos produtores, o cloreto de potássio. Por isso, o objetivo do presente trabalho foi avaliar um silicato de potássio nacional (K6) como fonte alternativa ao uso do cloreto de potássio para a cultura do feijão-vagem. Para tanto, sementes de feijão-vagem cv. Macarrão Rasteiro foram semeadas a campo em espaçamento de 0,50 x 0,20 m. Empregou-se o delineamento em blocos ao acaso com quatro tratamentos e cinco repetições. Os tratamentos foram constituídos da seguinte maneira: (i) testemunha – sem adubação potássica; (ii) cloreto de potássio; (iii) silicato de potássio – K6; (iv) 50% cloreto de potássio + 50% K6. Os fertilizantes foram aplicados no momento da semeadura e as doses determinadas com base na análise de solo e nas recomendações para a cultura. Foi realizada avaliação de altura de plantas, massa fresca e seca da parte aérea, massa fresca e seca de vagens, estimativa de produtividade e ocorrência de oídio, através de notas de severidade. Verificou-se que não houve influência da adubação potássica sobre o crescimento das plantas. De maneira geral, a produtividade de vagens apresentou baixa influência da adubação. Entretanto, a produtividade total de vagens foi maior em plantas adubadas com K6 em comparação a plantas adubadas com cloreto de potássio. A aplicação de K6 também contribuiu para a redução da severidade de oídio. Dessa forma, nós concluímos que o K6 é uma fonte de potássio viável em substituição ao cloreto de potássio para o feijão-vagem.

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Response of foliar rates of macronutrients in corn under nitrogen fertilization and the effects of waste of co-inoculation with Azospirillum brasilense in soybeans are evaluated. Soybean was planted in two treatments, namely, inoculation of seeds with Bradyrizobium japonicum, with and without co-inoculation with Azospirillum brasilense, followed by corn. Treatments for corn crop consisted of a combination of residual inoculation of Bradyrhizobium japonicum and the residual co-inoculation with Azospirillum brasilense within the band (main factor) applied to soybean seeds and five doses of N (0, 50, 100, 150 and 200 kg ha-1) applied to second harvest, consorted with Urochloa ruziziensis in the splits (secondary factor). Foliar rate of N, P, K, Ca, Mg and S for corn crops was determined. Efficiency of nitrogen usage (EUN), recovery of applied nitrogen (RNA), agronomic efficiency of applied N (EA) and physiological efficiency (EF) were determined. Data underwent analysis of variance and means of quality factor (inoculation) were compared by F test, whilst polynomial regression was applied for quantitative factor (N doses). Corn inoculation residue did not increase the rate of corn foliar N. However, there was an increase according to the dose of applied N. In the case of other nutrients (P, Ca, Mg), foliar increase of nutrients was detected in most doses when compared to co-inoculation and interaction between inoculation factors and N doses. There was no increase in K and S when compared to co-inoculation residue. Residual co-inoculation with Azospirillum brasilense in soybean improves corn physiology cultivated in succession and generates plants with greater production potential coupled to greater stress tolerance. [ABSTRACT FROM AUTHOR]

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O lodo de esgoto é um resíduo proveniente da Estação de Tratamento de Esgoto e na maioria dos casos não são aproveitados adequadamente sendo depositados em aterros sanitários e este resíduo apresenta todos os nutrientes essenciais para a nutrição mineral das plantas além de apresentar teores elevados de matéria orgânico que promove maior retenção de agua e melhorando os fatores físico e biológicos do solo. O objetivo deste experimento foi avaliar substratos a base de lodo de esgoto compostado e de casca de pinus no desenvolvimento, qualidade, nutrição das mudas do clone H13 (Eucalyptus grandis x Eucalyptus urophylla) e os teores de nutrientes no substrato. O delineamento experimental foi inteiramente casualizado com 5 tratamentos e 4 repetições compostas por 372 mudas por parcela. Os tratamentos foram: T1 – substrato de lodo de esgoto compostado enriquecido com K, Ca e Mg denominado PV; T2=PV+SC (substrato comercial a base de casca de pinus) na proporção 3:1, v:v; T3=PV+SC (1:1, v:v); T4=PV+SC (1:3, v:v); T5= SC. Os melhores tratamentos para o desenvolvimento de mudas de eucalipto do clone H13 foram: T1 (PV) e T2 (PV+SC, 3:1, v:v). As plantas cultivadas com o substrato de composto de lodo de esgoto obtiveram uma maior produtividade, desenvolvimento e maior acúmulo de N, P, K, Ca, S, B, Cu, Fe, Mn e Zn comparada com as plantas que foram utilizadas somente o substrato comercial.

Objetivou-se avaliar o crescimento inicial e os teores foliares de macronutrientes em plantas de quiabo (Abelmoschus esculentus L.) em função de diferentes doses e tipos de biofertilizantes. O experimento foi conduzido na fazenda experimental Piroás da Universidade da Integração Internacional da Lusofonia Afro-Brasileira (Unilab), no município de Redenção (CE). O delineamento experimental utilizado foi inteiramente casualizado, em esquema fatorial 5 x 2, referente a cinco doses de biofertilizante (0,0; 0,5; 1,0; 1,5 e 2,0 L planta-1 semana-1) e a dois tipos de biofertilizante (bovino e caprino). Foram analisadas as variáveis: altura de planta (AP), área foliar (AF), número de folhas (NF), diâmetro do caule (DC) e teores foliares de nitrogênio (N), fósforo (P), potássio (K), cálcio (Ca) e magnésio (Mg). O incremento das doses de biofertilizante contribuiu de forma positiva nas variáveis AP, AF, NF e DC. O insumo bovino foi mais eficiente quando comparado ao caprino para as variáveis AF e NF. O teor de N nas folhas foi elevado com o incremento das doses de biofertilizante. O fertilizante caprino promoveu um maior conteúdo de K nas folhas quando comparado ao bovino. Com a elevação das doses dos biofertilizantes bovino e caprino, os teores foliares de P, Mg e Ca foram reduzidos.

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.)

Copyright of Cientifica is the property of Fundacao de Apoio a Pesquisa e Extensao 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 Agricultural Research in the Tropics / Pesquisa Agropecuária Tropical is the property of Pesquisa Agropecuaria Tropical 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 IRRIGA - Brazilian Journal of Irrigation & Drainage is the property of Revista IRRIGA (Brazilian Journal of Irrigation & Drainage) 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 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.)

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.)

There is a lack of agronomic research on the production of custard apple seedlings, especially regarding the ideal substrate and nutritional requirement of the plants. In order to evaluate the accumulation of nutrients in shoots and roots, leaf chlorophyll index and absorption efficiency index (AEI) in custard apple seedlings grown in different substrates and under doses of slow-release fertilizer, an experiment was set in randomized blocks in split-plot scheme with four replicates and eleven plants per plot. The custard apple seedling production method was by sowing. Plots were represented by substrates (fresh sugarcane bagasse; enriched sugarcane bagasse; coconut powder, and commercial organic substrate), whereas subplots were represented by Osmocote Plus® fertilizer doses (0; 3; 6; 9; 12 and 15 kg m-3). The final evaluation was performed at 105 days after sowing. The effect of the slow-release fertilizer on the formation of custard apple seedlings was influenced by the substrate. There was greater accumulation of nutrients as the availability of nutrients increases, as well as increase in nutrient AEI. Custard apple seedlings were found to be more efficient to absorb N > Mg > K > Ca > P > Fe > Mn > Zn. As substrate, coconut powder associated with the 9 kg m-3 slow-release fertilizer dose is recommended to produce custard apple seedlings. [ABSTRACT FROM AUTHOR]

Copyright of Cientifica is the property of Fundacao de Apoio a Pesquisa e Extensao 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 Caatinga is the property of Revista Caatinga 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 objective was to evaluate the thermophosphate associated with mulch in the productivity and quality of fruit grown in Alta Paulista. The experiments were conducted in commercial orchards of acerola, guava and acid lime "Tahiti". The treatments were 1-Witness (T), 2-Witness plus mulch (CM), the straw being directed under the canopy of the fruit, 3-Witness with mulch and application of the thermophosphate Yoorin®, and 4-Witness with application of Yoorin®. An experimental block design was used, with 4 treatments and 5 repetitions. The data were subjected to analysis of variance for the F Test, and the means compared by the Tukey Test at the 5% level of significance. Visualizing the economic factor and the management dynamics of the production of these fruits, it should be noted that the thermophosphate when applied once per harvest, carries in its composition several nutrients, which can favor the rural producer to reduce the expense with complementary operations limestone application, and foliar fertilizations with micronutrients. The straw favored the decrease of the temperature of the soil, without interfering in the production of fruits, being able to still benefit the control of invasive plants, and to diminish the necessity of complementary irrigation in the orchard. It was concluded that the use of thermophosphate and mulch do not significantly alter the productivity and quality of acerola, guava and acid lime "Tahiti". The soil temperature decreases with the use of mulch made of brachiaria in the projection of the canopy of the guava and "Tahiti" acid lime orchards. [ABSTRACT FROM AUTHOR]

A vinhaça é um resíduo orgânico líquido proveniente do processo de fermentação para obtenção do etanol, é rica em potássio, nutriente essencial para o desenvolvimento da soja. A vinhaça é um resíduo classe II (não perigoso) caracterizado pela ausência de metais pesados e contaminates patogênicos por isso pode ser utilizada como biofertilizante em diversas culturas agrícolas. Objetivou-se através do presente trabalho estudar o efeito da aplicação de vinhaça na forma “in natura” e “concentrada” como fonte de potássio em substituição parcial e total na cultura da soja, avaliando os seus efeitos sobre a planta. O delineamento experimental utilizado foi o de blocos ao acaso, com quatro repetições, com os tratamentos distribuídos em função das condições da vinhaça (in natura e concentrada), aplicado na semeadura e coberturaassociado com a adubação mineral com cloreto de potássio na semeadura. Para o primeiro ano de cultivo a utilização da vinhaça promoveu para a soja condições para o melhor desenvolvimento da cultura pela avaliação de nodulação e crescimento da planta. A nodulação da soja respondeu positivamente a aplicação da vinhaça nos dois momentos de aplicação (semeadura e cobertura). A vinhaça pode ser utilizada como biofertilizante em substituição parcial ou total da adubação mineral com cloreto de potássio em soja, independentemente de sua forma de aplicação (in natura ou concentrada).

Existem no mercado agrícola bioestimulantes vegetais a base de alga, principalmente da Ascophyllum nodosum, porém praticamente não há pesquisas sobre o efeito destes produtos no crescimento e produtividade de grãos em condições de clima tropical. Diante do exposto, objetivou-se avaliar o efeito bioestimulante e fertilizante da alga Ascophyllum nodosum nos componentes produtivos e produtividade de grãos de trigo irrigado em região de Cerrado. A pesquisa foi desenvolvida em Selvíria – MS, em um Latossolo Vermelho Distrófico. O delineamento experimental foi em blocos ao acaso com cinco tratamentos e cinco repetições, sendo os tratamentos: Testemunha, aplicação única (aos 24 dias após emergência (d.a.e.) do trigo) ou dupla (aos 24 e 60 d.a.e) de extrato de Ascophyllum nodosum com o produto comercial polifértil®, e aplicação única (aos 24 d.a.e) ou dupla (aos 24 e 60 d.a.e) de extrato de Ascophyllum nodosum com o produto Acadian®. Os extratos de alga à base de Ascophyllum nodosum não influenciaram os componentes produtivos e produtividade de grãos de trigo, portanto sua utilização como bioestimulante não é necessária em solos com fertilidade adequada e cultivo irrigado.

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.)

Organic farming techniques gained popularity recently. Despite this increasing demand, there are still many problems, when comparing nutrient sources in organic and conventional farming systems. The study had as objective to evaluate the development of blueberry plants cultivar 'Climax' under protected cultivation in a substrate with different proportions of organic material and doses of applied mineral N. The blueberry nursery plants 'Climax' were transplanted into plastic pots and kept under protected cultivation. The soil and sand proportions were 40 and 20%, respectively, of the volume capacity of each pot. The remaining 40% were filled with organic material (bovine manure) and sawdust in the proportions of 5 and 35% (S1), 20 and 20% (S2) or 35 and 5% (S3), respectively. The experimental design was in complete randomized blocks, and the treatments were distributed in a 3x3 factorial arrangement, with six replications. The first factor was the different formulations of substrates. The second factor was N fertilization at 0, 10, and 15 g N plant-1. Evaluations of canopy volume, total leaf area, chlorophyll content and gas exchanges were performed six and eighteen months after transplanting. Fruits were harvested according to their ripening. Higher proportions of organic material in the substrate showed a substantial increase on estimated leaf area, canopy volume, chlorophyll content and clear efficiency of carboxylation (A/Ci), especially in plants that was not fertilized with mineral N. The highest yield was reported for the substrate S2, with intermediary amount of organic material, without the application of mineral N fertilizer. Considering agronomic and physiological traits, blueberry plants on the substrate S2 (20% OM) showed the best results, without mineral N fertilizing, becoming viable the organic management system for potted 'Climax' blueberry plants under protected cultivation. [ABSTRACT FROM AUTHOR]