EFFECT OF SUMMERFALLOW TILLAGE ON SOIL PHYSICAL PROPERTIES AND YIELD OF WHEAT

Abstract

On a fallow–wheat rotation on a loam soil in the Black soil zone of central Alberta, increased tillage over that required to control weeds had no effect on the yield of wheat. Four operations usually controlled weeds. Extra tillage had little or no effect on soil moisture conserved, wind-erodible aggregates, compaction or nitrate accumulation. Insufficient tillage adversely affected yield, moisture conservation and nitrate accumulation.