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Nutrient Cycling in Agroecosystems

, Volume 59, Issue 1, pp 13–18 | Cite as

Effect of long-term application of sewage sludge to a grazed grass pasture on organic carbon and nutrients of a clay soil in Zimbabwe

  • J. Nyamangara
  • J. Mzezewa
Article

Abstract

A study was conducted to assess the nutrient status of a Zimbabwean vlei clay soil grown to a Kikuyu (Pennisetum clandestinum Chiov.) grass pasture which had been amended with sewage sludge for 19 years. There was a significant (P<0.05) accumulation of organic C, mineral N, resin extractable P, and exchangeable K, Ca, Mg and Na in the top soil horizon. Organic C increased from 2.5 to 8.7% and 1.8 to 4.5% in the 0–5- and 5–10-cm horizons, respectively. Addition of sewage sludge resulted in a 19- and 57-fold increase in extractable P in the 0–5- 5–10-cm soil horizons, respectively. Exchangeable Na significantly (P<0.05) increased from 0.88 to 4.10 cmol/kg and from 1.04 to 3.06 cmol/kg in the 0–5- and 5–10-cm horizons, respectively. It was concluded that sewage sludge is a valuable source of nutrients and also provides an opportunity to increase soil organic matter.

long-term application sewage sludge soil nutrients 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • J. Nyamangara
    • 1
  • J. Mzezewa
    • 1
  1. 1.Chemistry and Soil Research InstituteCauseway, HarareZimbabwe

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