Can conservation agriculture improve phosphorus (P) availability in weathered soils? Effects of tillage and residue management on soil P status after 9 years in a Kenyan Oxisol

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• 作者：Andrew J. Margenot^a ; ^{ajmargenot@ucdavis.edu} ; Birthe K. Paul^b ; Rolf R. Sommer^b ; Mirjam M. Pulleman^b ; ^c ; Sanjai J. Parikh^a ; Louise E. Jackson^a ; Steven J. Fonte^d
• 关键词：Conservation agriculture ; Phosphorus ; Phosphatase
• 刊名：Soil and Tillage Research
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：166
• 期：Complete
• 页码：157-166
• 全文大小：588 K
• 卷排序：166

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.