Wetting Ability of Aqueous Herbicidal Sprays as a Factor Influencing Stands of Alfalfa Seedlings1

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Abstract
Wetting ability of an herbicidal solution was found to be a significant factor in determining the toxicity of preparations and rates of any one compound, but was of minor importance in explaining differences in toxicity between chemicals. 2,4‐D was the most toxic, followed by 2,4,5‐T, MCP, 3,4‐D, and 2,5‐D in that descending order. Artificial shading indicated that light available to alfalfa seedings in oats‐ was important in maintaining alfalfa stand. Shading increased the wettability of alfalfa leaves and presumably increased the toxicity of herbicides applied.

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