Effect of tillage and crop residue management on phosphorus transformation and phosphatase enzyme activity under pigeonpea (Cajanus cajan) rhizosphere and non-rhizosphere soil.

摘要

This manuscript focuses on the effects of tillage and crop residues management practices were examined on soil phosphorus transformation in pigeonpea rhizosphere and non-rhizosphere soil. Depletion in solution-P (0.05 M CaCl₂ extractable) content under all the treatments in rhizosphere soil indicated appreciable uptake from rhizosphere by plants as compared to non-rhizosphere soil. Tillage and crop residue management caused significant change in NaHCO₃-P and NaOH-P_i fraction of both rhizosphere and non-rhizosphere soils and the highest contents of both the fractions were observed in ZT-B with Rp+w. However, CT-B with Rp+w was statistically at par with ZT-F with R₀. Acid-P content of non-rhizosphere soil in conventional tillage decreased from its initial content (560 kg/ha) which suggested the transformation of Ca bound P (non-labile) of surface soil to other labile phosphorus fractions and subsequent utilization by crops. Residual-P is a highly non-labile and humus bound fraction of phosphorus which is not easily transformed due to tillage and crop residue management practices and also by pigeonpea rhizosphere. The highest acid and alkaline phosphatase enzymes activities were found higher in ZT-B with Rp+w in rhizosphere soil as compared to non-rhizosphere soil.