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Sampling Procedures for Estimates of Weed Yields in Corn Plots

Published online by Cambridge University Press:  12 June 2017

D. W. Staniforth ,
W. G. Lovely  and
F. B. Cady
D. W. Staniforth
Affiliation:
Agricultural Engineering Research Division, ARS, USDA
W. G. Lovely
Affiliation:
Agricultural Engineering Research Division, ARS, USDA
F. B. Cady
Affiliation:
Agricultural Engineering Research Division, ARS, USDA
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Abstract

Mature yellow foxtail [Setaria glauca (L.) Beauv.] infestations, growing in rows of corn, were harvested in 3 foot segments from paired 30 foot rows of corn. Basic analyses of variance were calculated so that the variances of plot sizes involving multiples of 3 feet could be determined and compared. Precision indices were calculated for harvesting various fractions of the plot area. Loss of precision did not exceed 25 percent when only 40 percent of the total area was harvested in random samples of 1-row X 3 feet, or in multiples of this basic unit. Practical implications of the findings are related to estimates of weed yields in crop-weed ecology studies and herbicide evaluation tests.

Type
Research Article
Information
Weeds , Volume 13 , Issue 4 , October 1965 , pp. 357 - 360
Copyright
Copyright © 1965 Weed Science Society of America 

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References

Literature Cited

1. Nieto, J. H. and Staniforth, D. W. 1961. Corn-foxtail competition under various production conditions. Agron. J. 53: 1–5.Google Scholar
2. Staniforth, D. W. 1957. Effects of annual grass weeds on the yield of corn. Agron. J. 49:551–555.CrossRefGoogle Scholar
3. Staniforth, D. W. and Lovely, W. G. 1964. Preemergence herbicides in corn production. Weeds 12:131–133.CrossRefGoogle Scholar