A Supply Parameter of Phosphorus in Soils and its Relationship to Phosphorus Nutrition of Wheat

In a greenhouse experiment, total P removal by wheat was found to be correlated well with the supply parameter (k₁k₂)^1/4 (qc/k₁k₂)^1/2 and cumulative desorption of phosphorus in four soils derived from different agro-climatic regions of north-west India. The quantity and intensity relations of these soils could be defined by a Langmuir-type equation, q=k₁c/k₂+c. A highly significant linear relationship was found to exist between cumulative desorption and the supply parameter indicating that either of these two indices can successfully define P supplying capacity of the soil