Response of Rice (Oryza sativa L.) to Top Dressing of Phosphorus Through Complex Fertilizers

摘要

A field experiment was conducted to study the effect of top dressing of phosphorus through complex fertilizers on rice during kharif 2009 on clayey soil at Agricultural College Farm, Bapatla. The experiment consisted of nine treatments viz., application of 60 kg P_2O_6 ha~(-1) as basal through SSP (T_1), DAP (T_2) and 20:20:0 (T_3), two equal splits (1/2 as basal + 1/2at maximum tillering stage) through DAP (T_4) and 20:20:0 (T_5), two equal splits (1/2 as basal + 1/2-at Panicle initiation (PI) stage) through DAP (T_6) and 20:20:0 (T_7), three equal splits (1/3 as basal + 1/3 at maximum tillering + 1/3 at PI stages) through DAP (T_8) and 20:20:0 (T_9). The results revealed that there was a significant increase in effective tillers' m~(-2), filled grains panicle~(-1), grain yield and phosphorus uptake with s two splits of P_2O_5 half as basal and half at maximum tillering stage either through DAP or 20:20:0. No significant variation was recorded with regard to growth, total grains panicle~(-1) and test weight due to sources of P at different times of application.