Comparison of efficiency of Mussoorie partially acidulated phosphate rock and single superphosphate in a shallow Alfisol of the Indian semiarid tropics
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The agronomic effectiveness of a partially acidulated phosphate rock (PAPR) was measured in a field experiment with sorghum (Sorghum bicolor cv. CSH-6) in a shallow Alfisol at the ICRISAT farm, Patancheru (Hyderabad), India. The experiment compared PAPR with single superphosphate. The PAPR was made by acidulating an indigenous Indian phosphate rock (Mussoorie) with H2SO4 at 50% acidulation level. P response was evaluated at a single relatively high N rate (120 kg ha−1) with five rates of P (0, 2.2, 4.4, 8.8, and 17.6 kg P ha−1). A significant response to P was obtained at rates up to 17.6kg P ha−1.
There was no significant difference due to source of P in terms of sorghum grain yield or total P uptake. Both Olsen and Bray 1 soil tests underestimated P availability from PAPR with respect to that from SSP.
A rapid rate of P uptake was observed during grain filling to maturity (81–102 days), when 40% of the total P was taken by the plant. The internal efficiency of both P sources was the same.
Key wordsAlfisol Bray 1-extractable P Mussoorie partially acidulated phosphate rock Olsenextractable P
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