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Full-season interference of Ipomoea hederacea with Gossypium hirsutum

Published online by Cambridge University Press:  12 June 2017

Mark L. Wood
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
R. Brent Westerman
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
Laval M. Verhalen
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
P. L. Claypool
Department of Statistics, Oklahoma State University, Stillwater, OK 74078


Four field experiments were conducted to measure the effects of seven Ipomoea hederacea (L.) Jacq. densities on Gossypium hirsutum L. lint yield, stripper-harvest efficiency, and fiber properties. The seven densities were 0, 2, 4, 6, 8, 10, and 12 weeds 10 m−1 of row. Data were used to develop prediction models to compare with those previously constructed that used fewer experiments and fewer weed densities in this range. Gossypium hirsutum lint yield in kilograms per hectare and as a percentage of the weed-free control best fit a linear regression model. Gossypium hirsutum lint yield reductions for each increase of one weed 10 m−1 of row ranged from 30.7 to 36.2 kg ha−1 at Chickasha and from 35.4 to 36.4 kg ha−1 at Perkins. Lint yield reductions for each weed 10 m−1 of row ranged from 3.8 to 6.9% at Chickasha and from 3.9 to 6.0% at Perkins. All plots could be mechanically stripper harvested, except for the 12-weed density at Chickasha in 1994 and the 10- and 12-weed densities at Perkins in 1996. Harvest efficiencies were not significantly different in any experiment. The only fiber properties to display significant differences were micronaire and strength at Chickasha in 1994. Prediction models calculated herein were highly similar to those previously constructed.

Weed Biology and Ecology
Copyright © 1999 by the Weed Science Society of America 

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