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Factors Affecting the Phytotoxicity of Norflurazon

Published online by Cambridge University Press:  12 June 2017

Chi-Chu Lo  and
Morris G. Merkle
Chi-Chu Lo
Affiliation:
Dep. Soil and Crop Sci., Texas A&M Univ., College Station, TX 77843
Morris G. Merkle
Affiliation:
Dep. Soil and Crop Sci., Texas A&M Univ., College Station, TX 77843
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Abstract

Norflurazon [4-chloro-5-(methylamino)-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone] decreased the total chlorophyll content and the chlorophyll a/b ratio of nine plant species. Grain sorghum [Sorghum bicolor (L.) Moench.], wheat (Triticum aestivum L.), and sicklepod (Cassia obtusifolia L. ♯3 CASOB) were the most susceptible plants, and cotton (Gossypium hirsutum L.) was the most tolerant. The soil properties most closely correlated with norflurazon activity were organic matter content and clay component, not clay content. A high treatment rate was necessary for effective control of plant growth in soil high in organic matter content and high in montmorillonite or vermiculite. Approximately twice as much norflurazon was required to reduce chlorophyll content 50% when applied to the soil preplant incorporated as was required when applied preemergence.

Keywords

I50partition coefficientchlorophyllclay contentclay mineralorganic matterCASOBHELAN
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 32 , Issue 2 , March 1984 , pp. 279 - 283
Copyright
Copyright © 1984 by the Weed Science Society of America 

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