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Annual ryegrass (Lolium multiflorum) competition with Kentucky bluegrass, hardinggrass, Blandon brome, wild oats, tall fescue, rose clover, and with itself was studied in greenhouse and field experiments. Ryegrass in a mixture of species always had a detrimental effect on the growth of other species. It did not furnish the usual advantages to other species which occur from a nurse crop or from litter. Annual ryegrass exhibited self—interference when grown in various combinations and densities.
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McKell et al. (1969) studied this question.
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