Fertilizer research

, Volume 36, Issue 1, pp 29–33 | Cite as

Comparison of efficiency of Mussoorie partially acidulated phosphate rock and single superphosphate in a shallow Alfisol of the Indian semiarid tropics

  • D. P. Verma
  • S. H. Chien
  • C. B. Christianson
  • G. Pardhasardhi


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 words

Alfisol Bray 1-extractable P Mussoorie partially acidulated phosphate rock Olsenextractable P 


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  1. Basak RK, Karmakar M and Debnath NC (198) Fertilizer value of partially acidulated Purlia rock phosphate. J Indian Soc Soil Sci 36: 729–732Google Scholar
  2. Chien SH and Hammond LL (1988) Agronomic evaluation of partially acidulated phosphate rocks in the tropics. IFDC - P-7, pp 1–10, International Fertilizer Development Center (IFDC), Muscle Shoals, AlabamaGoogle Scholar
  3. Hammond LL, Chien SH and Mokwunye AU (1986) Agronomic value of unacidulated and partially acidulated phosphate rocks indigenous to the tropics. Adv Agron 40: 89–139Google Scholar
  4. Khasawneh FE and Doll EC (1978) The use of phosphate rock for direct application. Adv Agron 30: 159–206Google Scholar
  5. Phyrites, Phosphates and Chemicals Ltd (1987) A natural phosphate fertilizer for direct application: Mining for agriculture, Mussoorie phosphorite project, Dehra Dun (India).Google Scholar
  6. Roy RN and Wright BC (1974) Sorghum growth and nutrient uptake in relation to soil fertility. II. N, P, and K uptake pattern by various plant parts. Agron J 66: 5–10Google Scholar
  7. Tandon HLS (1989) Management of fertilizer nutrients other than nitrogen in the semiarid tropics of India: Christianson CB (ed) Soil Fertility and Fertilizer Management in Semiarid Tropical India. International Fertilizer Development Center (IFDC), Muscle Shoals, AlabamaGoogle Scholar
  8. Tandon HLS and Kanwar JS (1984) A review of fertilizer use research on sorghum in India. Res Bull No. 8, pp 19–22. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, IndiaGoogle Scholar
  9. Terman GL, Moreno EC and Osborn G (1964) Acidulation of phosphate rock in soil. Soil Sci Soc Am Proc 28: 104–107Google Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • D. P. Verma
    • 1
  • S. H. Chien
    • 2
  • C. B. Christianson
    • 2
  • G. Pardhasardhi
    • 3
  1. 1.IFDC and seconded to the Resource Management ProgramInternational Crops Research Institute for the Semi-Arid Topics (ICRISAT)Andhra PradeshIndia
  2. 2.Resources Management Research and Development DivisionInternational Fertilizer Development Center (IFDC)Muscle ShoalsUSA
  3. 3.Resource Management ProgramInternational Crops Research Institute for the Semi-Arid Tropics (ICRISAT)Andhra PradeshIndia

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