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The seed physiological quality is related with climate variation during development. Thus, the aim of this study was to determinate the relation among climatic factors and germination of M. urundeuva seeds in different growing seasons and to predict the germination according to the climatic scenarios. Seeds from 14 crop seasons (2005 to 2018) and climatic data from the ‘Bebedouro’ weather station (Embrapa Semiarid) were used to determine the influence of climatic conditions on the vegetative, female and male flowers and the fruiting of M. urundeuva . The simple linear correlation and the multiple linear regression model were applied to determine the influence of climatic elements on the production of M. urundeuva seeds. The multivariate calibration model was developed using the previous selection of variables by the algorithm of successive projections. From the mathematical model, the germination of M. urundeuva seeds was predicted according to climate change, as provided by the IPCC. Seed germination showed a significant difference between harvests. Through the correlation it was observed that the temperature correlated negatively with all phenological phases of M. urundeuva . The quality of M. urundeuva seeds is related to the maximum, average and minimum temperature, average and minimum humidity, and precipitation. These climate variables during the different phenological phases of M. urundeuva affect the physiological quality of the seeds, and, in climate change scenarios, there will be a reduction in the seed production of this species. O clima e a producao de sementes de Myracrodruon urundeuva Allemao RESUMO A qualidade fisiologica das sementes esta relacionada as variacoes climaticas durante o seu desenvolvimento. Assim, o objetivo deste trabalho foi determinar a relacao entre os elementos climaticos e a germinacao de diferentes safras de sementes de M. urundeuva , bem como prever a germinacao frente aos cenarios climaticos. Foram utilizadas sementes de 14 safras (2005 a 2018) e os dados climaticos da estacao meteorologica de Bebedouro, pertencente a Embrapa Semiarido, para determinar a influencia das condicoes climaticas nas fases vegetativa, flores femininas e masculinas e da frutificacao de M. urundeuva . A correlacao linear simples e o modelo de regressao linear multipla foram aplicados para determinar a influencia dos elementos climaticos na producao de sementes de M. urundeuva . O modelo de calibracao multivariado foi desenvolvido empregando a selecao previa de variaveis pelo algoritmo das projecoes sucessivas. A partir do modelo matematico realizou-se a previsao da germinacao de sementes de M. urundeuva frente as mudancas climaticas, previstas pelo IPCC. A germinacao das sementes apresentou diferenca significativa entre as safras. Por meio da correlacao observou-se que a temperatura correlacionou negativamente com todas as fases fenologicas da M. urundeuva . A qualidade das sementes de M. urundeuva esta relacionada com a temperatura maxima, media e minima, umidade media e minima, e com a precipitacao. Essas variaveis de clima durante as diferentes fases fenologicas de M. urundeuva afetam a qualidade fisiologica das sementes, sendo que, em cenarios de mudancas climaticas, ocorrera uma reducao na producao de sementes desta especie. Palavras-chave: aroeira-do-sertao, mudancas climaticas, germinacao.

Devido ao aumento da ovinocultura nos ultimos anos, praticas de manejo precisaram ser aprimoradas para suportar o maior numero de animais por area, porem e preciso observar cada atividade produtiva individualmente. Assim, objetivou-se analisar a viabilidade economica e os componentes que exercem maior influencia sobre o custo da terminacao de ovinos em pasto de capim-tifton 85. O estudo foi realizado em duas etapas. Na etapa 1, realizou-se experimento visando avaliar a producao do capim-tifton 85 irrigado com efluente de tanque de piscicultura e fertilizado com NPK nos niveis de zero, 33, 67, 100, e 150% do recomendado pelo manual de analise de solo de Pernambuco-PE. Na etapa 2, consistiu do estudo da viabilidade economica da terminacao de ovinos simulada para areas de 10 ha com base nos resultados da producao alcancados na etapa 1. Realizaram-se calculos de custo fixo, variavel, operacional, total, margem bruta e liquida alem da lucratividade e rentabilidade. Os maiores custos foram com a terra e a compra de borregos. A margem bruta foi positiva para todos os sistemas, ja a margem liquida, a lucratividade e a rentabilidade, constatou-se que no sistema que nao foi fertilizado apresentou valores negativos (R$ -70.832,56, -19,14% e -16,06%) inviabilizando a atividade. O sistema com maior fertilizacao do solo (150% do recomendado de NPK) foi o mais lucrativo e economicamente viavel, pois apresentou valores positivos para os indices de lucratividade (17,39%) e rentabilidade (21,06%), superior aos demais, ja o sistema que nao utiliza fertilizacao e inviavel, pois apresenta lucratividade e rentabilidade negativa. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri",sans-serif; mso-ansi-language:PT-BR; mso-fareast-language:PT-BR;} A B S T R A C T Due to increase in sheep production in recent years, handling practices needed to be improved to support the largest number of animals per area, However is necessary to observe each productive activity individually. So, this study aimed to analyze the economic viability and the components that have more influence on the cost of sheep termination in pasture of Tifton 85. The study was conducted in two stages. In stage 1, was held experiments to evaluate the production of irrigated Tifton 85 with fish pond effluent and fertilized with NPK in zero levels; 33, 67, 100 and 150% of the recommended by soil analysis manual of Pernambuco-PE. In stage 2, of the study of the economic viability of the ovine simulated termination for a 10 ha area based on the results of production achieved in stage 1. Was carried fixed cost calculations, variable, operational, total, gross margin and net, beyond of lucrativity and profitability. The higher costs were with the land and the purchase of lambs. The gross margin was positive for all systems, since the net margin, the lucrativity and profitability, it was found that the system was not fertilized with negative values (R $ -70,832.56, -19.14% and -16.06%) impeding the activity. The system with greater soil fertilization (NPK 150% recommended) was the most lucrative and economically viable, because presented positive values for the lucrativity indices (17.39%) and profitability (21.06%), superior to the others already the system does not use fertilization is unfeasible because it presents lucrativity and negative profitability. Keywords: Cynodon spp., fertilization, lucrativity, viability of the production.

As mudancas climaticas, especialmente o aumento da temperatura e da concentracao de gases de efeito estufa na atmosfera , afetarao o crescimento e desenvolvimento das plantas. O objetivo deste trabalho foi avaliar o efeito de aumento da temperatura e da concentracao de CO2 na emergencia de plântulas de cebola das cultivares Alfa Sao Francisco, Franciscana IPA 10, Vale Ouro IPA 11 e Serena .O experimento foi conduzido em câmaras de crescimento, com controle de umidade, luminosidade, temperatura e CO2, durante 12 dias. O delineamento experimental utilizado foi o inteiramente casualizado, em esquema fatorial 4x4x2, com quatro cultivares de cebola, quatro temperaturas (25 oC; 28 oC; 31 oC e 34 oC) e duas concentracoes de CO2 (380 e 770 ppm) e , com quatro repeticoes e 36 sementes por tratamento. Sementes de cebola das cultivares Alfa Sao Francisco, Franciscana IPA 10, Vale Ouro IPA 11 e Serena foram semeadas em bandejas de polietileno com 36 celulas contendo substrato comercial e mantido nas diferentes concentracoes de CO2 e temperatura. Foram avaliados a porcentagem de emergencia, tempo medio de emergencia, velocidade de emergencia, indice de velocidade de emergencia, comprimento da parte aerea e comprimento da raiz principal. Os dados foram submetidos a analise de variância e as medias comparadas pelo teste de Scott Knott a 5% de probabilidade. As concentracoes de CO2 e as diferentes temperaturas proporcionaram efeitos significativos entre as cultivares para a maioria das variaveis analisadas. O aumento de CO2 e temperatura influenciaram no processo de emergencia de plântulas de cebola. Normal 0 21 false false false PT-BR JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-fareast-language:EN-US;} Climate change, especially atmosphere temperature and concentration of greenhouse gases increase, will affect plant growth and development . The aim of this study was to evaluate the effect of increased temperature and CO2 concentration in emergence of seedlings of onion cultivars Alfa San Francisco, Franciscan IPA 10, Valley IPA 11 Gold and Serena. The experiment was conducted in growth chambers with humidity, light, temperature and CO 2 control during 12 days. The experimental design was completely randomized in a 4x4x2 factorial scheme, with four onion cultivars , four temperatures (25 °C; 28 °C, 31 °C and 34 °C and two concentrations of CO2 (380 to 770 ppm), with four replications and 36 seeds per treatment. Seeds of onion cultivars Alfa Sao Francisco, Franciscana IPA 10, Vale Ouro IPA 11 and Serena were sown in plastic trays with 36 cells containing commercial substrate and placed in different CO 2 concentrations and temperature. Emergence percentage, average time of emergence, emergence speed, emergence speed index, shoot length and root length was evaluated. The data were submitted to variance analysis and the averages compared by Scott Knott test at 5% probability. The CO 2 concentrations and different temperatures produced different effects among cultivars for most of the variables. The increase of CO 2 and temperature influence the emergence onion seedlings process. Key-words: climate change, impacts, agriculture