The investigation was carried out to study the effect of Jhabua rock phosphate (JRP) in combination with single superphosphate (SSP), farmyard manure (FYM) and phosphobacteria (PB) on available nitrogen, phosphorus and potassium and heavy metals content in soil at post harvest stage of rice crop (CO 43) in clayloam soil. Combined application of JRP and SSP in 1:1 ratio along with FYM (12.5 t ha¹) and PB significantly increased the soil available nitrogen, phosphorus and potassium over application of 100 per cent JRP alone but comparable with application of 100 per cent SSP alone. The heavy metals content (Cr, Cd and Pb) in post harvest soil was recorded in traces and it was far below the tolerance limit.
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Tamil Nadu Agricultural University
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