Abstract
A field experiment was conducted on a loam soil (Sultanpur Soil Series) to observe the residual effect of phosphorus (P2O5) on sorghum fodder applied to wheat in a wheat-sorghum fodder rotation. The treatments applied to wheat were computed from modified Freundlich model which ranged from 8.04-54.48 mg kg-1 P (36.82 - 249.52 kg P2O5 ha-1) along with control with and without N and K2O. Maximum fresh fodder yield of 30.58 Mg ha-1 and oven dried yield (7.13 Mg ha-1) was obtained at residual Olsen-extractable P value of 20.75 mg kg-1. Fodder contained maximum P concentration of 0.19% with total P uptake of 13.55 kg ha-1. Olsen– extractable P built up to level of 20.75 mg kg-1 after wheat harvest was declined to 10.05 mg kg-1 after harvest of sorghum fodder. Similarly, maximum phosphorus recovery of 18.50% was obtained with sorghum fodder at residual P value of 20.75 mg kg-1 soil after wheat.
Obaid-ur-Rehman1, A.M. Ranjha2, , M. Jamil3 , Jalil Akhtar3. (2006) Residual effect of phosphorus applied to wheat on sorghum fodder in a loam soil , The Journal Soil & Environment , Volume 25, Issue 2.
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