The effects of nitrogen fertilizer applied in spring on swards of rye grass lolium perenne cultivar barlenna sown with 4 cultivars of white clover trifolium repens cultivars blanca sabeda olwen and s 100

Laidlaw, A.S.

Grass and Forage Science 35(4): 295-300


ISSN/ISBN: 0142-5242
Accession: 006665771

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N fertilizer was applied at 0, 30, 60 and 90 kg N ha-1 in March 1976, 1977 and 1978 to plots containing 'Barlenna' perennial ryegrass sown either alone or with 'Blanca', 'Sabeda', 'Olwen' and 'S100' white clover in 4 replicated blocks. Dry matter (DM) yield of all swards responded positively to N with the response being highest in the no-clover swards in 2 of the 3 yr. Annual DM yields were lower in the no-clover than in the mixed swards at any given N level. The higher levels of N reduced DM yield in mixed swards at some harvests in midsummer. Swards of 'S100' were consistently among the lower yielding mixed swards, whereas the other 3 clover cultivars varied in their relative yields. There were no N .times. cultivar interactions for white clover yields; irrespective of cultivar, N application reduced annual white clover yield by similar amounts. It is beneficial to apply moderate amounts of N fertilizer to mixed swards in spring and, under these conditions, the yield differences between swards including medium-large and smaller-leaved white clover cultivars are similar to differences between the inherent yield potential of these cultivars in mixed swards receiving no N.