Summary
The effect of three sources of P, hyper rock phosphate (HRP), basic slag (BSG) and triple super phosphate (TSP) applied at two rates, 9.6 kg P/ha and 19.2 kg P/ha, was studied at Central Agricultural Station (C.A.S.) and Mahaicony Abary Rice Development Scheme (M.A.R.D.S.). The experiments were carried out for two seasons at both the sites. Though, different P sources used gave some increase in the yield of rice, but, this effect was statistically non significant. The efficiency of P - kg of rough rice per kg of P applied - was the highest with TSP and BSG added at a lower rate.
The estimations of available soil P made indicated, that Truog's and Bray no. 1 methods underestimate the available P. The available P determined by Bray no. 2 method, appeared to be more in agreement with the results of yield response noted.
The percentage P content of rice grains was not significantly affected by different P treatments.
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Shukla, G.C. Effectiveness of different sources of phosphates on yield, available soil phosphorus and phosphorus content of bluebelle rice. Plant Soil 38, 447–455 (1973). https://doi.org/10.1007/BF00779026
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DOI: https://doi.org/10.1007/BF00779026