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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    We will mail you new results for this query: keywords==N use efficiency
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Apparent nitrogen fertilizer replacement value of grass-clover leys and of farmyard manure in an arable rotation. Part I : Grass-clover leys
Berge, H.F.M. Ten; Pikula, D. ; Goedhart, P.W. ; Schröder, J.J. - \ 2016
Soil Use and Management 32 (2016)S1. - ISSN 0266-0032 - p. 9 - 19.
Crop rotation - Farmyard manure - Fertilizer saving - Grass-clover - Mixed ley - N use efficiency - Nitrogen replacement value - Phosphorus deficiency - Potassium deficiency

Apparent nitrogen fertilizer replacement values of grass-clover leys (NFRVGCL) and farmyard manure (NFRVFYM) were studied in a long-term (24 years) experiment. This paper reports the results for grass-clover leys (GCL). Five rates of farmyard manure (FYM) and four rates of fertilizer nitrogen (N) were applied to two arable rotations (RotA - arable+silage maize; RotB - arable+GCL). Polynomial response surfaces fitted to dry matter (DM) yield and N offtake in the three arable crops were used to assess NFRVGCL by interpolation, at high (Method H) and low (Method L) N fertilizer rates, always comparing RotA and RotB at equal FYM rates. In Expt1 (started in 1980), arable crops in RotB required 188, 246, 270, 295 and 312 kg N/ha less fertilizer per cycle than in RotA, to match the DM yields found at highest fertilizer rate in RotA (Method H). These values refer to FYM rates of 0, 20, 40, 60 and 80 t/ha per cycle, respectively. Corresponding fertilizer savings in Expt2 (started in 1981) were 287, 323, 341, 346 and 337 kg N/ha per cycle. These NFRVGCL values represent savings of 50-83% (Expt1) or 77-92% (Expt2) in N fertilizer applied to the arable phase. Slightly lower NFRVGCL was found by Method L. Extra N offtake in RotB over RotA was a poor estimator of NFRVGCL, showing much lower values and different responses to FYM and fertilizer than NFRVGCL. Mixed leys enable large fertilizer savings in arable rotations. Journal compilation

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