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Sound P fertilizer management and maximum efficiency, insists on adequate understanding of Psoil interactions. Max.P adsorption capacity ranged from 12501834 g g1. Energy of adsorption varied from 0.2231.00 g ml1, P buffering capacity ranged from 139243 and P saturation ranged from 0.271.59 mol g1. Acid although extracted the highest amount of both native and applied P, showed the poorest relationship with relative dry matter and P uptake by rice. The critical level for Olsen P was found 5 mg kg1 for the coastal soils of Bangladesh. Tidal floodplain soils, on an average of 12 samples, contained 887 mg kg1 of total P of which only 0.01% remained in solution form, 1.84% in NaHCO3 extractable, 4.24% in NaOH extracted Pi fraction, 46.65% in NaOH Po, 28.19% in acid pool and 18.97% in residual pool. Continuous rice cultivation without P application, decreased the conc. of labile P, moderately labile P and stable P but with the addition of P increased the labile and moderately labile P. The labile P and stable P estimated through plant based approach explained the variability of relative dry matter yield of rice and P uptake better than the soil test approach.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
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