Influência da época de dessecação da Brachiaria Ruzizienses consorciada com milho Zea mays, no desempenho da cultura da soja Glycine Max

Abstract

The soy (Glycine max) is one of the main cultivations in Brazil, and if well handled owns a high productive potential. Therefore, it was made the integration of corn harvest with Braquiaria ruziziensis. The present paper aims at verifying the interference of the desiccation date of Braquiaria ruziziensis in soy development and productivity when being cultivated. The soy, which was cultivated, was Agroeste 3680 IPRO. In the integration of corn harvest with Braquiaria ruziziensis, and performormance of desiccation of braquiaria, it was used the herbicide Glyphosate in different days, T1 – 49 days, T2 – 42 days, T3 – 35 days, T4 – 28 days, T5 – 21 days, T6 – 14 days, T7 – 7 days before the soy plantation and T8 – in the day of leguminous plantation. The parameters analyzed were: germination, plants high (30,60 and 90 days post plantation), number of nodes, number of pods per plant, number of grains per pod, weigh of thousand seeds and productivity. The results were submitted to variance analysis and, when meaningful, a regression analysis was made, adjusting the equations to obtained data, taking into consideration the period of desiccation of braquiaria. For some analysis, it was compared the averages through Scott-Knott test to 5% of probability. The results have shown that the early desiccation of braquiaria may offer a better productive result in soy, highlighting the treatments 1 and 2 (5.340, 74 kg ha -1) and (5.185, 18 kg ha–1). The desiccation, too close to plantation, may interfere negatively, in the germination and development of cultivation.