Crop rotation. V. Effect of winter crop on soybean productivity and yield components of direct drilled

Abstract

Soybean productivity and yield components in succession to winter crops was studied for four years at EMBRAPA/Centro Nacional de Pesquisa de Trigo, at Passo Fundo, RS, Brazil. Soybean was directly drilled into stubble of some winter crops and mechanically harvested in 120 m² plots. Soybean yield and components such as number of grains and grain weight/plant were little influenced by the winter crops. There was a trend for soybeans to yield more when grown after barley and wheat. Soybean grown after rapeseed showed reductions on the 1,000-grain weight and final stand. This fact may be explained by seeding date rather than by the preceding winter crop.