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Effect of Nicosulfuron Rate, Adjuvant, and Weed Size on Annual Weed Control in Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

George Kapusta ,
Ronald F. Krausz ,
Mustajab Khan  and
Joseph L. Matthews
George Kapusta
Affiliation:
Dep. Plant Soil Sci., Southern Illinois Univ., Carbondale, IL 62901
Ronald F. Krausz
Affiliation:
Dep. Plant Soil Sci., Southern Illinois Univ., Carbondale, IL 62901
Mustajab Khan
Affiliation:
Dep. Plant Soil Sci., Southern Illinois Univ., Carbondale, IL 62901
Joseph L. Matthews
Affiliation:
Dep. Plant Soil Sci., Southern Illinois Univ., Carbondale, IL 62901
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Abstract

Field experiments were conducted in 1988 and 1989 to (i) evaluate annual weed control with nicosulfuron applied at rates of 17 to 70 g ai/ha with several additives and (ii) evaluate annual weed control with nicosulfuron applied at rates of 17 to 105 g/ha at three corn growth stages. In 1988, in the adjuvant study, giant foxtail control increased linearly with no additive or with urea ammonium nitrate as the rate of nicosulfuron increased. Petroleum oil concentrate, nonionic surfactant, and a combination of either petroleum oil concentrate or nonionic surfactant with urea ammonium nitrate applied with nicosulfuron increased giant foxtail control to 90% or greater regardless of rate both years. Nicosulfuron at all rates with no additive and in combination with all additives controlled 93% or more of redroot pigweed and Pennsylvania smartweed both years. Corn grain yield was related to the level of giant foxtail control. In the rate by corn growth stage study, giant foxtail, redroot pigweed, and Pennsylvania smartweed control was 90% or greater regardless of nicosulfuron rate or application stage both years. Corn grain yield was related more to the duration of weed competition than the level of weed control with grain yield 8 to 12% lower with nicosulfuron applied at the V7 growth stage compared with the V3 or V5 growth stage.

Keywords

Nicosulfuron, 2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]-N,N-dimethyl-3-pyridinecarboxamidegiant foxtail, Setaria faberi Herrm. ♯ SETFAPennsylvania smartweed, Polygonum pensylvanicum L. ♯ POLPYredroot pigweed, Amaranthus retroflexus L. ♯ AMAREcorn, Zea mays L. ‘Pioneer 3471.’Nonionic surfactantpetroleum oil concentratepostemergence urea ammonium nitrate
Type
Research
Information
Weed Technology , Volume 8 , Issue 4 , December 1994 , pp. 696 - 702
Copyright
Copyright © 1994 Weed Science Society of America 

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