Journal of
Soil Science and Environmental Management

  • Abbreviation: J. Soil Sci. Environ. Manage.
  • Language: English
  • ISSN: 2141-2391
  • DOI: 10.5897/JSSEM
  • Start Year: 2010
  • Published Articles: 311

Full Length Research Paper

Soil management effects on phosphorus sorption and external P requirement in oxisols of Malawi

Mnthambala F
  • Mnthambala F
  • Department of Crop and Soil Sciences, Lilongwe University of Agriculture and Natural Resources (LUANAR), Malawi.
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James H. A. Maida
  • James H. A. Maida
  • Department of Crop and Soil Sciences, Lilongwe University of Agriculture and Natural Resources (LUANAR), Malawi.
  • Google Scholar
Max W. Lowole
  • Max W. Lowole
  • Department of Crop and Soil Sciences, Lilongwe University of Agriculture and Natural Resources (LUANAR), Malawi.
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Venon H. Kabambe
  • Venon H. Kabambe
  • Department of Crop and Soil Sciences, Lilongwe University of Agriculture and Natural Resources (LUANAR), Malawi.
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  •  Accepted: 08 January 2016
  •  Published: 31 August 2016

Abstract

Oxisols are one of the major soils of Malawi and they are high in P sorption. Conservation agriculture has been practiced on this soil for some years now but soil management effects on P sorption and external P requirement (EPR) of Oxisols in Malawi have not, however, been determined. Soil management effects on P sorption and EPR of Oxisols in Malawi were therefore determined in the present study. The effects studied were conventional tillage (CT), no-tillage (NT) and crop rotation (CR). The soils differed considerably in their sorption characteristics, with the sorption maxima ranging from 413 to 345 mg P kg-1. Differences in sorption maxima and affinity due to soil management effects were statistically significantly (P ≤ 0.05). The sorption affinity (b) values ranged from 0.48 to 0.72 dm3 mg-1 and differences due to soil management effects were statistically significant (P ≤ 0.05) only between conventional tillage (CT) and no tillage (NT) or crop rotation (CR).  The sorption affinity due to NT was not statistically significant from that of CR. The b values were the highest in soils that had been subjected to CT.

 

Key words: Oxisols, soil management effects, sorption affinity, sorption maxima, external P requirement.