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Soil Phosphorus Transformations in Relation to its Availability, Crop Productivity and Soil Health

Phosphorus is the second most essential nutrient element for plant growth after nitrogen. It transforms in soil chemically and biologically and exist as organic and inorganic forms, out of which soluble inorganic forms are available to plants. Labile pool of phosphorus is the most available pool and non-labile pool is the least available pool of soil phosphorus. Availability of phosphorus in soil is generally low due to its slow diffusion and high fixation in both acidic and alkaline soils. Indiscriminate use of phosphatic fertilizers may lead to degradation of soil health, low crop yield and environmental quality. Application of organics, bio fertilizers, soil amendments or rock phosphate enriched compost along with chemical fertilizers is as an alternate over sole application of phosphatic fertilizers to enhance phosphorus use efficiency and crop productivity. Addition of organics reduces the fixation of soil phosphorus; also banding & subsurface placement of fertilizers and liming contribute to reduction in soil phosphorus fixation. This leads to increase in available pool of phosphorus which not only increases the uptake and yield of the crops but improves the soil health also.