Full TGIF Record # 59379
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Web URL(s):http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2494.1998.00152.x/epdf
    Last checked: 10/02/2015
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Publication Type:
i
Refereed
Author(s):Nassiri, M.; Elgersma, A.
Author Affiliation:C.T. de Wit Graduate School of Production Ecology, Wageningen Agricultural University, Deparment of Agronomy, Wageningen, the Netherlands
Title:Competition in perennial ryegrass-white clover mixtures under cutting. 2. Leaf characteristics, light interception and dry-matter production during regrowth
Article Series:Competition in perennial ryegrass-white clover mixtures
under cutting
Source:Grass and Forage Science. Vol. 53, No. 4, December 1998, p. 367-379.
# of Pages:13
Publishing Information:Oxford, Blackwell Scientific Publications
Keywords:TIC Keywords: Lolium perenne; Trifolium repens; Seed mixtures; Competition; Leaf area; Light penetration; Dry weight; Mowing frequency; Growth; Relative growth rate; Leaf area index; Cultivar variation; Specific leaf area; Leaf weight ratio
Cultivar Names:Alice; Gwenda; Retor
Abstract/Contents:"The effect of defoliation interval of growth patterns of contrasting perennial ryegrass (Lolium perenne)-white clover (Trifolium repens) mixtures was studied. The dynamics of increase in the leaf area, light interception and dry-matter (DM) production were measured within successive regrowth periods. No N fertilizer was applied. During 1995 six mixtures were cut eight (F1) or six (F2) at a stubble height of 5cm. The stubble composition was stable throughout the growing season: after harvest about 50 g DM m⁻² (with a white clover proportion of 0·52) was present with a leaf area index (LAI) of 0·5 (0·38 white clover). The percentage of intercepted radiation after cutting was 20-30% and increased during 3 weeks to about 95%. The relative growth rate of leaf area and DM was higher for white clover then for perennial ryegrass, with the proportion of clover in the LAI and DM increasing during each regrowth period. Mixtures with large-leaved white cover cv. Alice had a lower initial clover content after harvest, but a more rapid increase in clover LAI and DM than mixtures with the smaller leaved cvs Gwenda or Retor. Alice had the highest total clover and LAI and DM at harvest. Cutting frequency affected the change in white clover-perennial ryagrass ratio during regrowth. This was significantly higher in mixtures with Alice than in mixtures with Gwenda, but only under less frequent cutting (F2). In spring there was a mean white clover proportion of about 0·55 in the LAI and 0·45 in the total harvested DM. In summer the white clover proportion in the LAI and DM increased to 0·70-0·75. There was a decline during autumn, especially in F2 and in the mixtures with the small-leaved white clover cv. Gwenda and the medium-leaved cv. Retor. In contrast, grass DM and LAI declined from spring to summer. The decline in clover LAI in autumn was similar in Alice and Gwenda at frequent cutting (F1), but stronger in Gwenda in F2. Retor had the lowest clover specific leaf area (SLA). The SLA values of Alice and Gwenda were similar, SLA being similar between cutting treatments. No differences were found in leaf weight ratio (LWR) among the three white clover cultivars or between the grass cultivars, and LWR was not affected by cutting treatment. Defoliation interval had limited effects on the growth pattern and leaf characteristics of perennial ryegrass-white clover mixtures."
Language:English
References:33
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Nassiri, M., and A. Elgersma. 1998. Competition in perennial ryegrass-white clover mixtures under cutting. 2. Leaf characteristics, light interception and dry-matter production during regrowth. Grass Forage Sci. 53(4):p. 367-379.
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Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2494.1998.00152.x/epdf
    Last checked: 10/02/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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