The effect of clipping on interclonal competition in the grass Holcus lanatus: a response surface analysis

The effect of clipping on the outcome of interclonal competition in the clonal grass Holcus lanatus was investigated using a response surface analysis in a greenhouse pot experiment. All binary combinations of three clones were planted in mixtures at a range of frequencies and tiller densities from 18. 5 to 40 000 tillers m -2 . Two treatments, unclipped or clipped, were applied in two blocks. After 10 weeks of growth the biomass, tiller production and plant mortality of each clone in each treatment were measured. Plant mortality was low but was increased by increased density and clipping. The plant biomass and tiller number data sets were fitted to a competition model in the form of a non-linear difference equation. In all data sets the value of r 2 was over 0.99 and the biomass data sets showed non significant lack of fit to te model (...)

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