Residual nitrogen effect of clover-ryegrass swards on yield and N uptake of a subsequent winter wheat crop as studied by use of 15N methodology and mathematical modelling

Henning Høgh Jensen, Jan K. Schjoerring

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Abstract

The residual effect of 2-year-old swards of clover-ryegrass mixture and ryegrass in monoculture on yield and N uptake in a subsequent winter wheat crop was investigated by use of the 15N dilution method and by mathematical modelling. The amount of N in the wheat crop, derived from clover-ryegrass residues was 25–43% greater than that derived from residues of ryegrass which had been growing in monoculture. Expressed in absolute values, the N uptake in the subsequent winter wheat crop was 23–28 kg N ha−1 greater after clover-ryegrass mixture than after ryegrass in monoculture. Up to about 54 kg N ha−1 of the N mineralised from the clover-ryegrass crop was calculated to be leached, whereas only 11 kg N ha−1 was leached following ryegrass in monoculture.

Original languageEnglish
JournalEuropean Journal of Agronomy
Volume6
Issue number3-4
Pages (from-to)235-243
ISSN1161-0301
DOIs
Publication statusPublished - 1997
Externally publishedYes

Keywords

  • 15N
  • Intercropping
  • Isotope dilution method
  • Preceding crop effect
  • Residual N

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