The effects of soil management systems and winter crop rotation on wheat yi
eld and root diseases were assessed. No-tillage, minimum tillage, conventio
nal tillage using a disc plow plus disc harrow, and tillage using a moldboa
rd plow plus disc harrow were the soil managements compared. In crop rotati
on, three systems were used:system I(wheat/soybean), system II(wheat/soybea
n and common vetch/corn or sorghum), and system III (wheat/soybean, black o
ats or white oats/soybean, and common vetch/corn or sorghum). A randomized
block experimental design, with split-plots and three replicates, was used.
The main plots were formed by the soil management systems, while the split
-plots consisted of crop rotation systems. Yield of wheat grown under no-ti
llage and minimum tillage was higher than the yield of wheat grown under co
nventional soil tillage using either disc plow or moldboard plow. Crop rota
tion was efficient in reducing root diseases and in increasing wheat yield.