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Publication Date
1977
Description
A technique is described to evaluate under grazing the large number of mixtures of grass and legume possible with the increasing numbers of herbage cultivars. Measurements were made under sheep grazing with and without applied nitrogen of the component species yields of 15 grass and legume monocultures and their 54 grass-legume mixtures. Data from the final grazing of the establishment year were examined for interactions between the competing grasses and legumes using regression analysis. The coITelation between cultivar yield and suppressive effect on associates in mixture was strongly negative. Interactions between yield and associate effects observed were related to seasonal growth periodicity of legumes and insensitivity of a strongly aggressive grass to legume competition. Nitrogen responses of legumes appeared to be mediated through the direct response of grasses to applied nitrogen. A case is made for the conjoint selection of grasses and legumes for their competitive combining ability.
Citation
Harris, Warwick, "An approach to evaluate a large number of mixtures under grazing" (1977). IGC Proceedings (1977-2023). 31.
(URL: https://uknowledge.uky.edu/igc/1977/sess2/31)
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An approach to evaluate a large number of mixtures under grazing
A technique is described to evaluate under grazing the large number of mixtures of grass and legume possible with the increasing numbers of herbage cultivars. Measurements were made under sheep grazing with and without applied nitrogen of the component species yields of 15 grass and legume monocultures and their 54 grass-legume mixtures. Data from the final grazing of the establishment year were examined for interactions between the competing grasses and legumes using regression analysis. The coITelation between cultivar yield and suppressive effect on associates in mixture was strongly negative. Interactions between yield and associate effects observed were related to seasonal growth periodicity of legumes and insensitivity of a strongly aggressive grass to legume competition. Nitrogen responses of legumes appeared to be mediated through the direct response of grasses to applied nitrogen. A case is made for the conjoint selection of grasses and legumes for their competitive combining ability.
