Abstract
ABSTRACTThis study applied a dynamic nutrient balance method to estimate a stock of soil phosphorus and its usage pattern. We used panel data of published agricultural production, fertilizers supply, and livestock population to assess the net inflows, outflows, and stock of phosphorus in 19 regions of Tamil Nadu in the years 1990–2012. The dynamic model supported us to find pattern of phosphorus stocks and flow over the period, and more importantly, the total phosphorus outflow breakdown into removal by crop, soil, air, and water. This model simultaneously assesses the phosphorus stock, flows, and outflows inclusion of time factor, and thus it is one of robust agricultural environmental indicators. This paper will support the farmers and stakeholders to take an appropriate policy according to status of nutrient in the estimated agricultural regions.
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