Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Effect of straw application on rice yields and nutrient availability on an alkaline and a pH-neutral soil in a Sahelian irrigation scheme
    Asten, P.J.A. van; Bodegom, P.M. van; Mulder, L.M. ; Kropff, M.J. - \ 2005
    Nutrient Cycling in Agroecosystems 72 (2005)3. - ISSN 1385-1314 - p. 255 - 266.
    flooded soils - ammonia volatilization - nitrogen transformations - urease activity - paddy soil - nitrification - system - denitrification - hydrolysis - dynamics
    Like elsewhere in the Sahel, actual rice yields (3-5 t ha-1) are far below yield potential (±8 t ha-1) in an irrigation scheme in central southern Mauritania. Earlier studies showed that yields are especially low on alkaline soils due to N and P deficiency. We investigated the potential of rice straw application as a mean to improve yields and fertilizer efficiency on an alkaline soil (pH 8.2) and a pH-neutral soil (pH 6.2). Application of 5 t straw ha-1 increased yields by 1.1 t ha -1 on average, independent of soil type and fertilizer dose. Contrary to our study, similar studies in Asia showed little short-term effects of straw on yield and N uptake. Straw application improved N availability, but not P availability. The improved N availability was attributed to N mineralized from the straw, from increased mineralization of soil organic matter (SOM) with a low C:N ratio (<7.2) and from increased mineral fertilizer N (urea) recovery efficiency. We deduced that improved N fertilizer recovery upon straw application was due to reduced nitrification-denitrification losses. On the alkaline soil, volatilization was important, but that process seemed unaffected by straw application. We hypothesize that the positive effects of straw application at our study site are due to low soil C content (<43 g kg -1) and low C:N ratio compared to most lowland rice soils in Asia
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