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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Record number 332896
Title The combined effect of fertiliser nitrogen and phosphorus on herbage yield and change in soil nutrients of a grass/clover and grass-only sward
Author(s) Schils, R.L.M.; Snijders, P.J.M.
Source Nutrient Cycling in Agroecosystems 68 (2004)2. - ISSN 1385-1314 - p. 165 - 179.
Department(s) PE&RC
Crop and Weed Ecology
Wageningen Livestock Research
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) grass/fertiliser-n system - clover swards - dairy system - netherlands - performance - agriculture - management - policies - mixtures
Abstract The combined effect of reduced nitrogen ( N ) and phosphorus ( P ) application on the production of grass- only and grass/ clover swards was studied in a five- year cutting experiment on a marine clay soil, established on newly sown swards. Furthermore, changes in soil N, P and carbon ( C ) were measured. Treatments included four P ( 0, 35, 70 and 105 kg P ha(-1) year(-1)) and three N levels (0, 190 and 380 N kg ha(-1) year(-1) ) and two sward types ( grass- only and grass/ clover ). Nitrogen was the main factor determining the yield and quality of the harvested herbage. On the grass- only swards, N application increased the DM yield with 28 or 22 kg DM kg N-1, at 190 or 380 kg N ha(-1) year(-1), respectively. The average apparent N recovery was 0.78 kg kg(-1). On the grass/ clover swards, N application of 190 ha(-1) year(-1) increased grass production at the cost of white clover, which decreased from 41 to 16%. Phosphorus application increased grass yields, but did not increase clover yields. A positive interaction between N and P applications was observed. However, the consequences of this interaction for the optimal N application were only minor, and of little practical relevance. Both the P- AL- value and total soil P showed a positive response to P application and a negative response to N application. Furthermore, the positive effect of P application decreased with increasing N application. The annual changes in P- AL- value and total soil P were closely related to the soil surface surplus, which in turn was determined by the level of N and P application and their interaction. The accumulation of soil N was similar on both sward types, but within the grass-only swards soil N was positively affected by N application. The accumulation of organic C was unaffected by N or P application, but was lower under grass/ clover than under grass- only.
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