Abstract
We investigated P retention by an Alfisol treated with lime and gypsum. For this purpose a surface sample of Pindorian series (Udic Haplustalf) receiving either lime or gypsum @ 200 g kg·1 soil was incubated under lab condition after adding P @ nil and 100 mg P kg·1 . Soil treatment with lime and gypsum significantly (p < 0.001) decreased water-soluble and NaHC03 extractable (Olsen) P in descending order at different rates of P application. On an average, reduction in NaHC03 extractable P by lime addition was 36 % (range 30 to 37 %) which was 52 % (range 48 to 53 %) by gypsum addition. Relationship between water-soluble and soil retained (sorbed) P was best described by the Freundlich equation. Two P sorption equations at low (5 to 25 mg P kg" soil) and high (50 to 300 mg P kg" soil) rates of P application were observed for lime-amended soil. An augmented tendency of P retention by solid phase was revealed by higher intercept and slope values calculated for Freundlich equation in lime and gypsum amended soils. Further studies on P release pattern are suggested in lime and gypsum amended soils, which would be important for plant nutrition. Key words: P application- calcareous soils- P nutrition- Olsen P

Rahmatullah, M. Sallrr, K. Hussain. (2003) PHOSPHORUS RETENTION IN AN ALFISOL AMENDED WITH LIME AND GYPSUM, , Volume 40, Issue 1,2.
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