Author(s):

Rashmi Priyadarshi, Santosh Kumar and CD Choudhary

Abstract: Three prevalent cropping systems with different tillage practices were tested in factorial randomized block design, each replicated thrice at two depths i.e. 0-15&15-30 cm to evaluate their impact on availability of different fractions of phosphorus in soil. Three treatments in main plot for tillage practices were: Zero tillage (ZT), Permanent Bed (PB) and Conventional tillage (CT) and three treatments in sub plot for cropping system were: Rice-Wheat (R-W), Maize-Wheat (M-W) and Maize-Maize (M-M). The results shows that tillage and cropping system had significant impact on the Iron, Aluminium and calcium bound phosphorus content in surface (0-15 cm) and sub-surface soil (15-30 cm) soil. The highest Iron and Aluminium bound phosphorus was found in zero tillage system (ZT) followed by Permanent bed (PB) and conventional tillage (CT) system at both surface and sub-surface soils. Whereas, Rice-Wheat (R-W) system shows highest Iron, Aluminium and calcium phosphorus content followed by Maize- Wheat system and Maize-Maize system. Residual phosphorus at surface level, the maximum was observed in ZT fallowed by PB and CT system. However, at sub surface permanent bed showed higher residual phosphorus fallowed by ZT and CT.

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