Residual effect of fertilizer phosphorus in lowland rice
Medhi, D.N. | De Datta, S.K.
To evaluate residual recoveries of fertilizer phosphorus (P) two field experiments were conducted in Quezon Province, Philippines during 1991 dry season, under irrigated condition. Average grain yield increase was 0.50-0.9 t/ha due to residual effects of inorganic fertilizer P, regardless of course. Residual effects of fertilizer P with Sesbania rostrata or alone increased grain yield by 0.3-1.0 t/ha over control. Significantly higher yields were obtained with S. rostrata fertilized with Morocco phosphate Rock (MPR) and S. rostrata + MPR applied on rice than the control. Results revealed that there is a promising effect of residual P from the applied P sources in increasing rice grain yield. Total P uptake increased due to residual P from fertilizer P applied. Results suggest that increased P uptake increased dry matter and grain yield.
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