文摘
Conservation agriculture effects on soil P were evaluated in a Kenyan Oxisol (9 yr). Residue (2 t ha−1) had no effect on aggregation, P fractions, or phosphatase activity. Reduced tillage increased aggregation, labile P, and P sorption, and decreased pH. Weak or no changes occurred for organic C and P stocks and phosphatase activities. The reduced tillage component of CA offers limited but positive impacts on soil P.