Figure 9

Interactive effect of PSB and P sources on soil Olsen extractable P (mg kg−1) at day 28. Bars with the different letters are significantly different (P ≤ 0.001) according to LSD test. Error bars indicate stander error (n = 3). SSP, RP, PM and FYM indicate single super phosphate, rock phosphate, poultry manure and farm yard manure respectively.