Effect of the source and rate of Humic acid on Phosphorus transformations
2006
Sarir, M.S. | Durrani, M.I. | Mian, I.A.
An incubation experiment was carried out in vitro to monitor changes in bicarbonate extractable phosphate, resulting from the addition of applied-P (SSP) reinforced with both Farm Yard Manure (humic acid basis) and humic acid (lignitic coal). A calcareous soil was incubated with SSP (60 kg ha-1) alone and in different combinations with Farm Yard Manure (FYM) and humic acid (200, 400, 800, 1600 and 2000gms ha-1). Addition of FYM could not help in the mineralization of applied-P. The non significant effect of Farm Yard Manure on P-mineralization suggests that FYM recommendations on the basis of humic acid content do not fulfil the actual humic acid requirements. Therefore, further work is needed to incorporate additional parameters to fulfill the actual humic acid requirements. Humic acid (lignitic coal) applied @ 200g ha-1 showed least P-immobilization both from native and applied-P pool during 16 week of incubation. Percent P recovery and mineralized-P was also greater in humic acid @ 200g ha-1 soil.
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