Crop rotation in Guarapuava. XIII. Effects of crop succession systems on yield and on other agronomic characteristics of soybean, under no-tillage

Abstract

The effects of crop succession systems on yield and on other agronomic characteristics of soybean were assessed at the Cooperativa Agrária Mista Entre Rios Ltda., in Guarapuava, Paraná, Brazil. Four cropping systems were tested in which soybean was seeded after different winter crops (white oat, barley, flax, and wheat) distributed in a number of crop rotation systems. The crops were seeded under no-tillage. A randomized complete block design, with four replications, and plots with 60 m², was used. Soybean after the succession flax, wheat, and common vetch presented lower height of insertion of the first pods. Soybean grown after the succession white oat, wheat, lupine, and barley showed lower plant height. Soybean following the succession wheat and common vetch; wheat, common vetch, and flax; wheat, lupine, barley, and white oat; wheat monoculture; barley, white oat, wheat, and lupine showed the best performance, in relation to the parameters studied.