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Interference and Seed Production by Common Lambsquarters (Chenopodium album) in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

S. Kent Harrison
S. Kent Harrison*
Affiliation:
Dep. Agron., Ohio State Univ., Columbus, OH 43210
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Abstract

Multiple regression and response surface plots were used to analyze the effects of common lambsquarters population density and interference duration on weed growth and soybean seed yield. Under favorable growing conditions in 1986, weed biomass production at all population densities and interference durations was four to five times that produced in 1987, under less favorable conditions. However, there was no significant treatment by year interaction for soybean seed yield reduction by common lambsquarters, and production of each kg/ha weed biomass resulted in an average soybean yield reduction of 0.26 kg/ha. Utilizing 5% yield loss as an arbitrary threshold level, the regression equation predicted a common lambsquarters density threshold of 2 plants/m of row for 5 weeks of interference after crop emergence and 1 plant/m of row for 7 weeks. Seed production by individual common lambsquarters plants was highly correlated (r=0.92) with weed dry weight, and seed production ranged from 30 000 to 176 000 seeds/plant.

Keywords

Common lambsquarters, Chenopodium album L. ♯ CHEALsoybean, Glycine max L. Merr., ‘Century 84’Competitionweed lossesCHEAL
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 2 , March 1990 , pp. 113 - 118
Copyright
Copyright © 1990 by the Weed Science Society of America 

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