Effect of redefoliation on the regrowth and water soluble carbohydrate content of Lolium perenne.
1994
Fulkerson W.J.
Plants of Lolium perenne, set up in a minisward in a glasshouse, were redefoliated at 3, 6 or 3 plus 6 days after defoliation at 2 or 5 cm stubble height. Regrowth, water soluble carbohydrate (WSC) content, and tillers per plant and tiller weight were measured. At the extreme, 70 percent of plants died when they were defoliated at 2 cm stubble height and redefoliated at 3 plus 6 days laters. The mean total regrowth at the 3 leaves per tiller stage (and including the DM yield at each redefoliation) of the surviving plants was 4 percent of plants not defoliated and cut to the same stubble height. Redefoliation had a less marked effect on plants cut at 5 cm stubble height, reducing total regrowth by 55, 78 and 95 percent, for plants redefoliated at 3, 6 or 3 plus 6 days, respectively. There was a very significant relationship between tillers per plant and stubble WSC or stubble DM at the one and a half leaf stage of regrowth on DM yields at the 3 stage of the regrowth cycle. These results confirm that dramatic effect of redefoliation on regrowth of ryegrass plants, and support the recommendation that grazing duration in the field be restricted to less than 3 days to prevent stock regrazing new leaf.
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