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A method for determining the biological effect of herbicide mixtures

, : A method for determining the biological effect of herbicide mixtures. Weed Science 29(4): 469-473

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 2 mixtures (pyrazon: less TCA; 1:25 and 1:50). The sigmoid log-dose relationship for dry matter yield was fitted with a 4-parameter logistic equation. Generally, the mixtures appeared 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 2 growth media. At higher dose levels the mixtures approached the reference model, and the bioactivity of 1 mixture (1:25) in the water culture experiment even showed a higher activity than would be expected from the reference model.


DOI: 10.2307/4043333

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