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Nutrient Cycling in Agroecosystems

, Volume 46, Issue 1, pp 71–79 | Cite as

Characterization of soil-fertilizer P reaction products and their evaluation as sources of P for gram (Cicer arietinum L.)

  • G. K. Ghosh
  • K. S. Mohan
  • A. K. Sarkar
Article

Abstract

Laboratory studies on the characterization of soil-fertilizer P reaction products were carried out by reacting three-soils occurring in a toposequence in the plateau region of Bihar (India) with saturated solutions of diammonium orthophosphate (DAP), triple superphosphate (TSP) and ammonium polyphosphate (APP) for 1 hour and 24 hours. The reaction products (precipitates) formed in the solutions after 120 days of incubation were isolated and identified through X-ray diffraction technique.

Results indicate the formation of Brushite [CaHPO4 · 2H2O, Strengite (FePO4 · 2H2O), Variscite (AIPO4 · 2H2O) and Fe4(P2O7)3 as major soil-fertilizer P reaction products in these soils with ortho-and polyphosphates as source of phosphorus.

Pot cultures were used to evaluate the relative efficiency of reaction products (Struvite, Brushite, Variscite and Strengite), orthophosphates (DAP and SSP) and polyphosphate (APP) as sources of P for gram (Cicer arietinum L.) in a typical acid soil. Results indicate significant response of gram to different sources and level of added P. The dry weight and P uptake at 0, 6 and 12 mg P kg-1 soil were 0.406, 0.519 and 0.609 (g pot-1); and 0.289, 0.428 and 0.575 (mg P pot-1), respectively. Among the sources , struvite proved to be superior or equally effective as APP, DAP or SSP as sources of P for gram. Uptake of P also varied significantly with different P sources and levels of P application. Strengite was least effective in enhancing yield and P uptake by the crop.

Key words

ammonium poly-phosphate diammonium orthophosphate fertilizer reaction gram Indian soils phosphorus P uptake single superphosphate triple superphosphate yield 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • G. K. Ghosh
    • 1
  • K. S. Mohan
    • 1
  • A. K. Sarkar
    • 1
  1. 1.Department of Soil Science and Agricultural ChemistryBirsa Agricultural UniversityRanchiIndia

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