Effect of Submergence and Phosphatic Fertilizers on Phosphate Potentials - A Measure of Phosphorus Availability in Acid Soils of Karnataka


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Authors

  • Ramesh Thangavel
  • R. Ananthanarayana
  • K. Rajasekar
  • A. Balusamy
  • R. Krishnappa
  • S. Ramachandran

Keywords:

phosphate potential, equilibrium phosphate potential, single super phosphate, diammonium phosphate, Missouri rock phosphate, phosphorus supplying power

Abstract

The use of phosphate potential (PP) and equilibrium phosphate potential (EPP), a measure of readily available phosphorus in soil, to predict the phosphorus supplying power of submerged soil is reliable but the information so for available is insufficient to draw a valid conclusion. An experiment was conducted with single super phosphate (SSP), diammonium phosphate
(DAP) and Missouri rock phosphate (MRP) (applied @ 200 ppm P) and two period of submergence (up to 30 and 60 days) to study the effect of submergence and different sources of phosphatic fertilizers on PP and EPP. Due to submergence up to 30 days, decrease in PP and EPP was noticed in all four soils irrespective of different phosphatic fertilizer sources. This decrease in PP and EPP indicates the increased availability of inorganic phosphate
(H2PO4-) ions due to the submergence. On prolonged submergence up to 60 days, decrease in PP and EPP was noticed in soils having low pH. Among the four soils, Shimoga soil recorded increased PP and EPP with all phosphatic fertilizer sources including control. Among the phosphatic fertilizers, the highly soluble fertilizers like DAP and SSP application significantly
increased H2PO4- ion concentration in soil solution when compared to MRP, which is acid soluble one. The correlation studies revealed that changes in PP and EPP due to submergence and different phosphatic fertilizers application were found to be significant. However, available phosphorus was more negatively and significantly correlated with EPP.

Author Biographies

  • Ramesh Thangavel

    Division of Natural Resource Management, ICAR Research Complex for NEH Region, Umiam-763103, Meghalaya



  • R. Ananthanarayana
    Department of Soil Science and Agricultural Chemistry University of Agricultural Sciences, Bangalore 560065
  • K. Rajasekar
    Sugarcane Breeding Institute, Regional Centre, Karnal-132001, Haryana
  • A. Balusamy
    Division of Natural Resource Management, ICAR Research Complex for NEH Region, Umiam-763103, Meghalaya
  • R. Krishnappa
    Division of Natural Resource Management, ICAR Research Complex for NEH Region, Umiam-763103, Meghalaya
  • S. Ramachandran
    National Bureau of Soil Survey and Land Use Planning, Regional Centre, Jorhat 785004, Assam

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Submitted

2019-10-24

Published

2019-10-24

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Section

Articles

How to Cite

Effect of Submergence and Phosphatic Fertilizers on Phosphate Potentials - A Measure of Phosphorus Availability in Acid Soils of Karnataka. (2019). Indian Journal of Hill Farming, 32(1). https://epubs.icar.org.in/index.php/IJHF/article/view/94780