Effect of cultivation of black oats and ryegrass as pasture and wheat on yield and other agronomic characteristics of soybean

Abstract

During four seasons (1985/86 to 1988/89), five cropping systems were evaluated at the National wheat Research Center - CNPT/EMBRAPA (Passo Fundo, Brazil) for yield and other agronomic characteristics of soybean. Soybean was cultivated in succession with different winter crops (black oats, ryegrass and wheat), distributed in several crop rotation systems. Soybean was established under direct-drilled system. Plots of 18 m² and a randomized block design with four replications were used. All studied characteristics were influenced by the year factor. Soybeans grown after wheat, black oats, and ryegrass showed no significant differences for yield, number of legumes, grain weight/plant, 1,000 grain weight, final stand and insertion of the first pods. Nevertheless, number of grain and plant height were influenced by the preceding winter crops.