Transformation of applied phosphorus in soils under rice-wheat cropping sequence

Abstract

The transformation of phosphorus in a rice-wheat cropping sequence was studied on alluvial, black, red and laterite soils of India. Phosphorus applied to rice increased Al-P and Fe-P in all soils, R-P in alluvial, black and laterite, and Fe-P and Ca-P in laterite soil only, while it increased native Fe-P in black and red soils. Phosphorus applied to rice and recovered as Al-P was higher after wheat than after rice in alluvial, red and laterite soils. In alluvial and laterite soils, the sum of total inorganic phosphorus fractions in no-P treatment was almost the same after the harvest of rice or wheat, while in black and red soils it was lower after wheat than after rice.