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Diffusion of Herbicides to Seed

Published online by Cambridge University Press:  12 June 2017

H. D. Scott  and
R. E. Phillips
H. D. Scott
Affiliation:
Dep. of Agronomy, Univ. of Kentucky, Lexington, Kentucky
R. E. Phillips
Affiliation:
Dep. of Agronomy, Univ. of Kentucky, Lexington, Kentucky
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Abstract

Prior to germination, seed of some plant species either adsorb or absorb some herbicides applied to the soil. Equations were developed describing the concentration of the herbicide expected in the seed both when diffusion of the herbicide in the soil is the limiting factor and when diffusion of the herbicide within the seed is the limiting factor. Expected concentrations of the herbicide in the seed were presented for combinations of three seed radii (seed were assumed to be spheres) five diffusion times, and five diffusion coefficients. The calculated concentrations of the herbicide in the seed in ppm increased as seed size or radii decreased. This theoretical result was consistent with experimental data and potentially explains why some large-seeded plant species are difficult to control with the use of herbicides. The equation developed for a perfect “sink” predicted within experimental error the concentration of isopropyl m-chlorocarbanilate (chlorpropham) absorbed by soybean (Glycine max (L.) Merr.) seed from aqueous solutions of chlorpropham.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 2 , March 1971 , pp. 128 - 132
Copyright
Copyright © Weed Science Society of America 

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References

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