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Temporal and spatial distributions of velvetleaf seedlings after 1 year's seeding

Published online by Cambridge University Press:  12 June 2017

Allan S. Hamill
Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0


Two separate experiments were conducted from 1974 through 1980 and from 1976 through 1982 at an experimental farm in southwestern Ontario, Canada, to determine the pattern of temporal and spatial distributions of velvetleaf seedlings from seed produced by uncontrolled plants. For each experiment, a soybean field with no previous record of velvetleaf infestation was selected and planted with four patches of 10 velvetleaf plants. The plants were allowed to grow to reproductive maturity for 1 yr, and the density and spatial distribution of velvetleaf seedlings within the field were mapped over the next 6 yr. Although velvetleaf seedlings emerged each year after seeding, the highest percentage emerged the second year after seeding. Velvetleaf seedlings emerged at locations with or without a seeding plant, but a high density of emerged seedlings was often observed at locations some distance away from the seeding plants. The results suggest that under conventional harvesting methods there may not always be a close spatial relationship between the distribution of parent plants and their offspring, depending on the scale of the land and biotic and abiotic environmental conditions.

Weed Biology and Ecology
Copyright © 1998 by the Weed Science Society of America 

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Present address: Department of Plant Sciences, North Dakota State University, Loftsgard Hall, P.O. Box 5051, Fargo, ND 58105-5051;


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