1000 resultados para Glycine soja Sieb.
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2016
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Atualmente, com a expanso do cultivo de soja em terras baixas no Rio Grande do Sul, o capim-arroz (Echinochloa spp.) tem-se constitudo como importante planta daninha, ocasionando perdas na produtividade de gros da cultura.
Resumo:
O uso de Brachiaria ruzizienses para a formao de palhada em sistema de plantio direto tem se expandido no Cerrado. Essa cobertura alm de proteger o solo contra a eroso, representa uma importante fonte de nutrientes. O objetivo deste trabalho foi avaliar o potencial da Brachiaria ruzizienses como cicladora de fsforo e potssio e seu efeito sobre a produtividade de soja (Glycine Max). O experimento foi inteiramente casualizado com trs tratamentos: Solo sem palhada e sem adubao; com palhada de braquiria e sem adubao mineral; e com palhada de braquiria e adubao mineral (500kg 02-23-10). A brachiria foi semeada em dezembro/2006 e dessecada no inicio de outubro/2007, quando foi plantada a soja. A palhada foi pesada e retirada amostra para anlise de fsforo e potssio. A braquiria produziu em mdia 12,3 t ha-1 de matria seca, atingindo 19,8 t ha-1. Na palhada foram encontrados em mdia 25,1 e 33,1 Kg ha-1, de P2O5 e K2O, respectivamente, sendo que em alguns casos, foram encontradas quantidades superiores extrada pela soja. Mesmo com os altos teores de nutrientes contidos na palhada, observou-se resposta positiva da soja ao uso de fertilizante. Contudo o acrscimo de produtividade superior ao custo do tratamento.
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2016
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2016
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2016
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2016
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2016
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2016
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1995
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2013
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2016
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2016
Resumo:
To test the hypothesis that the plant stress related elicitor cis-jasmone (cJ) provides protection in soybean pods against the seed-sucking stink bug pest, Euschistus heros, the growth of E. heros on cJ-treated pods was investigated using three soybean cultivars differing in insect susceptibility, i.e. BRS 134 (susceptible), IAC 100 (resistant) and Dowling (resistant). E. heros showed reduced weight gain when fed cJ-treated Dowling, whereas no effect on weight gain was observed when fed other treated cultivars. Using analysis of variance, a three factor (cultivar x treatment x time) interaction was observed with concentrations of the flavonoid glycosides daidzin and genistin, and their corresponding aglycones, daidzein and genistein. There were increases in genistein and genistin concentrations in cJ-treated Dowling at 144 and 120 h post treatment, respectively. Higher concentrations of malonyldaidzin and malonylgenistin in Dowling, compared to BRS 134 and IAC 100, were observed independently of time, the highest concentrations being observed in cJ-treated seeds. Levels of glycitin and malonylglycitin were higher in BRS 134 and IAC 100 compared to Dowling. Canonical variate analysis indicated daidzein (in the first two canonical variates) and genistein (in the first only) as important discriminatory variables. These results suggest that cJ treatment leads to an increase in the levels of potentially defensive isoflavonoids in immature soybean seeds, but the negative effect upon E. heros performance is cultivar-dependent.
Resumo:
The purpose of this work was to analyze the logistical distribution of Brazilian soybean by applying a quadratic programming to a spatial equilibrium model. The soybean transportation system is an important part of the soybean complex in Brazil, since the major part of the costs of this commodity derives from the transportation costs. Therefore, the optimization of this part of the process is essential to a better competitiveness of the Brazilian soybean in the international market. The Brazilian soybean complex have been increasing its agricultural share in the total of the exportation value in the last ten years, but due to other countries' investments the Brazilian exportations cannot be only focused on increasing its production but it still have to be more efficient. This way, a model was reached which can project new frames by switching the transportation costs and conduce the policy makers to new investments in the sector.