Abstract
A short-term greenhouse pot culture study was carried out to study the agronomy efficacy of P sources for cotton crop in a vertisol. The sources of P were single super phosphate (SSP), diammonium phosphate (DAP) and nitrophosphate tagged with 32P and applied at three rates (30, 60 and 90 kg P2O5 ha−1). The results indicated that the dry matter yield (DMY) of cotton shoot, P uptake, percent P derived from fertilizer (%Pdff) and Avalue of the soil increased significantly with increasing fertilizer rate, whereas the percent fertilizer P utilization (%FUP) was found to be higher at lower fertilizer rates. Among the fertilizer sources SSP was found to be superior in enhancing DMY of cotton, P uptake and %FUP as compared to other fertilizers. %Pdff was found to be at par in SSP and DAP treatments and was significantly higher in comparison to NP and reverse was true in case of A-value of the soil. Results on equivalent ratio showed that SSP and DAP are equally efficient, whereas, 1 kg P as SSP was equivalent to 7.47 kg P as NP. In general, efficacy of phosphatic fertilizers for cotton crop in vertisol was found to be in order of SSP>DAP>NP.
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Srivastava, M., D’Souza, S.F. Assessment of agronomic efficacy of phosphatic fertilizers for cotton crop in vertisol using 32P radiotracer technique. J Radioanal Nucl Chem 274, 397–401 (2007). https://doi.org/10.1007/s10967-007-1128-7
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DOI: https://doi.org/10.1007/s10967-007-1128-7