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Fall and Spring Herbicide Treatment for Minimum-Tillage Seeding of Alfalfa (Medicago sativa)

Published online by Cambridge University Press:  12 June 2017

G. W. Mueller-Warrant  and
D. W. Koch
G. W. Mueller-Warrant
Affiliation:
Dept. Plant Sci., Univ. of New Hampshire, Durham, NH 03824
D. W. Koch
Affiliation:
Dept. Plant Sci., Univ. of New Hampshire, Durham, NH 03824
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Abstract

Experiments were conducted at three locations to evaluate the efficacy of fall and spring herbicide treatments for vegetation control and enhancement of alfalfa (Medicago sativa L.) establishment. on a sward dominated by quackgrass [Agropyron repens (L.) Beauv.], fall and spring glyphosate [N- (phosphonomethyl) glycine] treatments were equally effective in reducing competition from quackgrass and in establishing alfalfa. on a mixed grass sward, spring and fall glyphosate treatment resulted in similar alfalfa yields with early spring seeding; however, alfalfa yields were lower with delayed seeding on fall-treated plots, compared with spring treatment, because of greater weed competition. Pronamide [3,5-dichloro(N-1,1-dimethyl-2-propynyl) benzamide] applied in the fall controlled perennial grasses, and when it was followed by paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) in the spring controlled broadleaf weeds as well, resulting in greater alfalfa yields compared with pronamide alone. Alfalfa established more slowly in the paraquat-treated and check plots, than in glyphosate-treated plots.

Keywords

Agropyron repensglyphosateparaquatpronamide
Type
Research Article
Information
Weed Science , Volume 31 , Issue 3 , May 1983 , pp. 391 - 395
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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