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Ecological Effects of Barnyardgrass on Soybeans in a Greenhouse

Published online by Cambridge University Press:  12 June 2017

M.A. Maun
M.A. Maun*
Affiliation:
Dep. Plant Sci., Univ. of Western Ontario, London, Ont. N6A 3B7. Canada
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Abstract

Greenhouse studies were conducted to study the competition between soybeans [Glycine max (L.) Merr. ‘Vansoy’] and barnyardgrass [Echinochloa crus-galli (L.) Beauv.]. The competition was initiated or terminated when soybeans were 2, 3, 4, 5, 6, 7, 8, 9, and 10 weeks old. The reproductive efficiency of soybeans was not lowered by 4 to 7 weeks of competition after planting of soybeans. Competition between the two species for the entire growing season resulted in a significant decrease in plant height of soybeans. The total dry matter per plant was negatively correlated with an increase in the length of competition. Competition during the first 5 to 9 weeks of the life cycle of soybeans was more deleterious to soybean productivity than the last 5 to 9 weeks of its life cycle.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 2 , March 1977 , pp. 128 - 131
Copyright
Copyright © 1977 by the Weed Science Society of America 

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