MIRZA B. B, SHARIF Z. M. , SZOMBATHOVA N., ZAUJEC A.
Abstract
The effect of sesbania and phosphorus application (0,15,30,60 and 90 kg P/ha) on rice field under sodic soil conditions was investigated. Results revealed that green manuring and P application significantly increased the productive tillers and paddy and straw yield. Maximum paddy yield was recorded with the application of 90 kg P/ha. Significant differences among the treatments were observed. P requirement of rice for realizing near maximum yield (95 percent of maximum) was 57.5 kg P/ha with sesbania and 64.5 kg P/ha without sesbania. Agronomic efficiency and P recovery by rice were significantly greater with green manuring as compared to no green manuring. Agronomic P efficiency was significantly greater at the lowest level of P application. Phosphorus recovery by rice ranged from 10.17 to 20.59 % with a meanof 15.4 %.
The highest percent recovery of P fertilizer was the recorded at the lowest rate (15 kg P/ha) of P application.
Key words:
lowland rice, N uptake, P requirement, salinity, agronomic efficiency