Phosphorus (P) nutrition of the cropping system with rice crop is very important due to alternate wetting and
drying cycles. A field experiment was conducted on Bhalike soil series (Typic Camborthid) to observe the residual
effect of P on the succeeding crops and the level of P depletion after one crop rotation (Wheat- Sorghum FodderRice). Rice was raised on the residual P. The highest significant yield of paddy (3.41 Mg ha-1) and straw (3.53 Mg
ha-1) was found where residual P was 10.95 mg kg-1. Maximum P concentration (0.15 %) in paddy was found at
residual P level of 10.85 mg kg-1 while in straw it was maximum (0.12 %) where residual P was 9.75 mg kg-1.
Similarly, P uptake was significantly higher in paddy (5.33 kg ha-1), straw (4.25 kg ha-1) and Paddy straw (9.58 kg
ha-1) at residual P level of 10.95 mg kg-1. Level of P depletion at the end of three crops was found at 0.004 mg kg-1
per annum where P was applied at 37.12 mg kg-1 soil and this depletion enhanced where no NPK was applied
and deteriorated further where only NK was applied without P. However at the higher rates of P application, no
depletion was observed.
Obaid-ur-Rehman, A.M. Ranjha, S.M. Mehdi, Bashir Ahmad, Sher Afzal, A. Hannan. (2007) Residual Effect And Level Of Phosphorus Decline Under Cereal Based Cropping System , , Volume-44, Issue-4.
