The Role of Light, Concentration, and Species in Foliar Uptake of Herbicides in Woody Plants

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Uptake of 2 herbicides into leaves of 10 species of woody plants was studied. In most species, picloram entered faster and was accumulated at higher concentrations than 2,4,5-T. Leaves of these species absorbed 2,4,5-T in amounts relative to their susceptibility to 2,4,5-T. A circle of tissue cut from a leaf absorbed more than an entire leaf. In the range 0.004 to 0.5M, sodium acetate had little effect on uptake of either herbicide by live oak leaves. The abaxial surface of the leaf usually absorbed more than the adaxial surface. Herbicides entered live oak leaves in amounts approximately proportional to the log of the concentration of the herbicide outside of the leaf. Light intensity was inversely related to herbicidal uptake by live oak leaves and light quality had no significant effect.

Document Type: Journal Article

Affiliations: Associate Professor, Dept. of Soil and Crop Science, Texas A & M University

Publication date: June 1, 1968

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