Summary
Tillage practices during the fallow period benefit water storage and yield in dryland wheat crops. However, there is currently no clarity on the responses of soil organic carbon (SOC), total nitrogen (TN), and available nutrients to tillage practices within the growing season. This study evaluated the effects of three tillage practices (NT, no tillage; SS, subsoil tillage; DT, deep tillage) over five years on soil physicochemical properties. Soil samples at harvest stage from the fifth year were analyzed to determine the soil aggregate and aggregate-associated C and N fractions. The results indicated that SS and DT improved grain yield, straw biomass and straw carbon return of wheat compared with NT. In contrast to DT and NT, SS favored SOC and TN concentrations and stocks by increasing th
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