POPULAÇÃO DE PLANTAS E NITROGÊNIO PARA FEIJOEIRO CULTIVADO EM SISTEMA DE PLANTIO DIRETO

Abstract

The availability of nitrogen interferes in the dry matter quantity produced by the common bean crop, carrying on earlier or later closure of row spacings. Thus, the objective this study was to evaluate the response of common bean in three plants population (200, 240 and 300,000 plants per ha) in winter, to the nitrogen application at sowing (10 or 20 kg ha-1) and nitrogen rates at sidedressing (0, 25, 50, 75 and 100 kg ha-1). The experimental design was a randomized block with four replicates in a factorial arrangement 3x2x5. According to the results obtained it was concluded that: a smaller plants population provided significant increase on productivity. Nitrogen rates at sowing (10 or 20 kg ha-1) did not alter the common bean productivity. The application of increasing nitrogen rates proposed significant increment of productivity and the fertilization with 100 kg ha-1 at sidedressing increased in 20% the grain productivity compared with the control.