00272nam a2200097Ia 4500008004100000082001500041100003400056245005100090260002600141300000700167140113s9999    xx            000 0 und d  a631.4   L1  a"Kanwar, J.S. & Grewal, J.S."  aReview of Phosphorous fixation in Indian soils  a1971bICARcNew Delhi  a51