Hp. Dossantos et al., EFFECT OF CROP-ROTATION ON WHEAT IN NO-TI LLAGE SYSTEM, IN GUARAPUAVA, PR, Pesquisa agropecuaria brasileira, 31(4), 1996, pp. 259-267
From 1984 up to 1993, at the Cooperativa Agraria Mista Entre Rios Ltda
., Guarapuava, PR, Brazil, the effects of some crop rotation systems o
n yield, control of root diseases, and other agronomic characteristics
of wheat were assessed. Four rotation systems for wheat were studied:
1) monoculture; 2) one winter without wheat; 3) two winters without w
heat; and 4) three winters without wheat. The crops grown in summer we
re soybean or corn. Both winter and summer crops were grown under no-t
illage, except in the winter of 1989, when limestone was applied befor
e planting winter crops. A randomized complete block design, with four
replications and plots with 60 m(2), was used. The crop rotation was
efficient in controlling root diseases of wheat. Crop rotation of whea
t under no-tillage controlled root diseases. Wheat grain yields decrea
sed linearly as the severity of root diseases increased.