Abstract
In southern Africa, tillage research has focused on rainfed smallholder cropping systems, while literature on high-input irrigated cropping systems is limited. We evaluated the effects of conventional (CT), minimum (MT) and no-till (NT) tillage systems on soil organic carbon (SOC), bulk density, water-stable aggregates (WSA), mean weighted diameter (MWD) and crop yields in an irrigated wheat-cotton rotation. Soil data were mon- itored in the first and final year, while yields were monitored seasonally. Average bulk densities (1.5-1.7 Mg m -3 ) were similar among tillage systems, but often exceeded the critical limit (1.60 Mg m -3 )
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