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A Method for Determining the Biological Effect of Herbicide Mixtures

Published online by Cambridge University Press:  12 June 2017

J. C. Streibig
J. C. Streibig*
Affiliation:
Dep. Crop Husbandry and Plant Breeding, Royal Veterinary & Agric. Univ., 2630 Taastrup, Denmark
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Abstract

Experiments were conducted in growth chambers by growing oats (Avena sativa L. ‘Ansi’) in water culture and soil with admixed TCA (trichloroacetic acid), pyrazon [5-amino-4-chloro-2-phenyl-3-(2H)-pyridazinone], and two mixtures (pyrazon: less TCA; 1:25 and 1:50). The sigmoid log-dose relationship for dry-matter yield was fitted with a four-parameter logistic equation. Generally, the mixtures appeared to be less active than would be expected under an additive dose model. Around GR50 the departure of joint action of the mixtures from the reference model was almost similar in the two growth media. At higher dose levels the mixtures approached the reference model, and the bioactivity of one mixture (1:25) in the water culture experiment even showed a higher activity than would be expected from the reference model.

Keywords

Bioassaylogistic curve fittingherbicide mixturesantagonismlogit
Type
Research Article
Information
Weed Science , Volume 29 , Issue 4 , July 1981 , pp. 469 - 473
Copyright
Copyright © 1981 by the Weed Science Society of America 

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