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Carbon and nitrogen dynamics in a phosphorus-deficient soil amended with organic residues and fertilizers in western Kenya

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Abstract

The contribution of organic resources to the restoration of soil fertility in smallholder farming systems in East Africa is being tested as an alternative to costly fertilizers. Organic inputs are expected to have advantages over fertilizers by affecting many biochemical properties controlling nutrient cycling. Our study examined changes in soil C and N, C and N mineralization, microbial biomass C (MBC) and N (MBN), and particulate organic matter (POM) in a P-limiting soil in western Kenya after applications of organic residues and fertilizers to overcome P limitation to crops. Leaf biomass from six different tree (shrub) species was incorporated into the soil at 5 Mg ha−1 for five consecutive maize growing seasons, over 2.5 years. Triple superphosphate was applied separately at 0, 10, 25, 50, and 150 kg P ha−1 in combination with 120 kg N ha−1 as urea. Soil inorganic N, soil organic C, mineralizable N, and total C in all POM fractions and total N in the 53- to 250-μm POM fraction increased following addition of all organic residues compared to the control. Whether there was an advantage of organic residue incorporation over inorganic fertilizer use depended on the soil parameter studied, the organic residue and the rate of fertilization. Most differences were found in N mineralization where 14.4–21.6 mg N kg−1 was mineralized in fertilizer treatments compared to 25.2–30.5 mg N kg−1 in organic residue treatments. C and N mineralization and the 53- to 250-μm POM fractions were the most sensitive parameters, correlating with most of the studied parameters. Organic residues can contribute to improved soil nutrient cycling while the magnitude of their contribution depends on the biochemical properties of the residues.

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Acknowledgements

We would like to thank Paul Smithson, Catherine Gachengo, Benson Muli, Joshua Mulinge and Wilson Ngului of ICRAF and the Tropical Soil Biology and Fertility Programme (TSBF), Nairobi, for their assistance in the laboratory analyses, and Eva Gacheru for her contribution to the coordination of the field work. Financial support for this work was obtained from the International Development Research Centre and the Soil, Water and Nutrient Management Programme of the Consultative Group on International Agricultural Research through grants to the TSBF, and a scholarship from the Katholieke Universiteit Leuven, Belgium.

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Authors and Affiliations

  1. Laboratory of Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, 3001, Heverlee, Belgium

    Generose Nziguheba & Roel Merckx

  2. Lamont Campus, The Earth Institute at Columbia University, P.O. Box 1000, 117 Monell Building, 61 Route 9W, Palisades, NY, 1064-8000, USA

    Cheryl A. Palm

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  1. Generose Nziguheba
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  2. Roel Merckx
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  3. Cheryl A. Palm
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Correspondence to Generose Nziguheba.

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Nziguheba, G., Merckx, R. & Palm, C.A. Carbon and nitrogen dynamics in a phosphorus-deficient soil amended with organic residues and fertilizers in western Kenya. Biol Fertil Soils 41, 240–248 (2005). https://doi.org/10.1007/s00374-005-0832-0

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  • DOI: https://doi.org/10.1007/s00374-005-0832-0

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