Wheat cropping systems with white and black oats for grain production

Abstract

During the period from 1985 to 1989, at the National Wheat Research Center (CNPT-Embrapa), Passo Fundo, Rio Grande do Sul, Brazil, the effects of crop rotation systems with white (Avena sativa) and black oats (Avena strigosa) on wheat (Triticum aestivum) yield and root disease severity were assessed. The cropping systems comprised: 1) monoculture of wheat; 2) one winter with wheat, and one with black oat; 3) one winter with wheat, and two with black oats; 4) one winter with wheat, and three with black oats; 5) one winter with wheat, and two with white oats; 6) one winter with wheat, and three with white oats. Root disease severity was higher under monoculture than under rotation, even in seasons with normal precipitation. Grain yield was not influenced by cropping systems, in the mean of years. Root disease severity and grain yield of wheat in rotation systems were influenced by the year.