Effect of crop rotation with annual winter pastures on yield of wheat

The effects of grain production systems with annual winter pastures on yiel d and root diseases control of wheat were assessed during six years at the CEPAGRO-Centro de Extensao e Pesquisa Agronomica at the School of Agronomy, Passe Fundo University, in Passe Fundo, Rio Grande do Sul, Brazil. Four gr ain production systems with annual winter pastures were evaluated: system I (wheat/soybean, black oats/soybean, and black oats/soybean); system II (wh eat/soybean and black oats + common vetch/corn); system III (wheat/soybean, black oats + common vetch/soybean, and black oats + common vetch/corn); an d system IV (wheat/soybean, white oats/soybean, and white oats/soybean). Cr ops were grown under no-tillage during winter and summer. A randomized bloc k design with three replications was used. No significant differences were found for intensity of wheat root diseases between system means. System I s howed higher wheat yields, as compared to the remaining systems.