DRYLAND GRASS–ALFALFA MIXTURE YIELDS AND INFLUENCE OF ASSOCIATES ON ONE ANOTHER

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Abstract
Crested wheatgrass, intermediate wheatgrass, streambank wheatgrass, Russian wild ryegrass, awnless brome, green needlegrass, and Rambler alfalfa were used in 10 mixtures, each comprised of two grasses and alfalfa. The study was conducted during the 1955 to 1962 period on a dryland site in the semiarid prairie region at Swift Current, Sask. Account was taken of the seasonal yields and basal area changes of the components making up the mixtures. Combinations of persistent grasses inflicted a deleterious two-way squeeze on the alfalfa associate and resulted in lower yields. Among the worst in this respect were Russian wild ryegrass, streambank wheatgrass, and awnless brome. Among the least competitive were intermediate wheatgrass and green needlegrass. The latter showed the most promise as a natural second grass component since it developed, persisted, and yielded well but did not suppress associated components.

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