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Nitrogen application in amenity-types of Lolium perenne L. grown for seed production

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  • Department of Genetics and Biotechnology
  • Afgrødeøkologi og Produktkvalitet
Three amenity-type perennial ryegrass (Lolium perenne) cultivars Elka, Taya and Pippin were undersown in 1991-93 in spring barley at Roskilde and R<o>nhave, Denmark, and given 0, 30 or 60 kg N ha-1 in autumn combined with 70, 100 or 130 kg N ha-1 in spring. Seed yield did not differ among cultivars or locations but was significantly increased by autumn N, spring N and their interaction. The application of 30 or 60 kg N ha-1 in autumn increased seed yield, but this increase was lower than that for a single spring application, provided that the N applied in spring was 100 kg ha-1 or greater. Shoot N content varied considerably among years but not cultivars. Correlation analysis of N content, yield components and seed yield revealed that autumn N application resulted in an increasing N content in shoots, fertile tiller number and seed weight. However, these two components were negatively correlated, and total seed yield was therefore not affected. The one exception was in 1991 when at one location dry matter production in autumn was low, and autumn N application resulted in increased N content, fertile tiller number and seed yield
Original languageEnglish
JournalJournal of Applied Seed Production
Pages (from-to)71-75
Number of pages5
Publication statusPublished - 1998

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