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The Effects of Fresh Water Storage on the Germination of Certain Weed Seeds: I. White top, Russian knapweed, Canada thistle, morning glory, and poverty weed

Published online by Cambridge University Press:  12 June 2017

V. F. Bruns  and
L. W. Rasmussen
V. F. Bruns
Affiliation:
Division of Weed Investigations, BPISAE, U. S. Departmen of Agriculture
L. W. Rasmussen
Affiliation:
Agronomy Department, Washington State College
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Extract

Water, especially water used for irrigation, has been adjudged for many years an important agent in the dissemination of weed seeds. Egginton and Robbins (7) found a total of 81 different species of weeds in 156 weed seed catches from three different ditches during 1918 and 1919 and determined that the number of weed seeds passing a given point on a ditch which averaged 12 feet in width during a period of 24 hours may reach several millions. Hope (11) analyzed a considerable number of weed seed catches from irrigation channels during 1924 and 1925. He computed that 1,674,030 seeds of 13 different weed species which occurred on the surface and to a depth of 1.57 inches in one 10-foot ditch passed during a 24-hour period on September 2, 1925. Further computations illustrated that the flow of weed seeds would amount to a deposition of 170,800 seeds per acre of land in one 6-inch irrigation. The latter computations were based on the assumption that the seeds were distributed uniformly over the cross section of the ditch at the point of catch.

Type
Research Article
Information
Weeds , Volume 2 , Issue 2 , April 1953 , pp. 138 - 147
Copyright
Copyright © 1953 Weed Science Society of America 

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References

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