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Movement and Sorption of Chemicals Applied to the Soil

Published online by Cambridge University Press:  12 June 2017

S. M. Lambert ,
P. E. Porter  and
R. H. Schieferstein
S. M. Lambert
Affiliation:
Shell Development Company, Modesto, California
P. E. Porter
Affiliation:
Shell Development Company, Modesto, California
R. H. Schieferstein
Affiliation:
Shell Development Company, Modesto, California
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Abstract

The movement of chemicals in the soil caused by water percolation was treated in a manner analogous to the development of materials through chromatographic columns. A “slotted tube test” was developed, which simulated a miniature field plot, utilizing a chromatographic soil column and the growth of either seeds or an indicator organism in agar as the detector. It was found that the median effective dose was higher for the more strongly sorptive soils. When correlations were made between soil compositions and the corresponding median effective doses for nonionic organic molecules, virtually all of the variations in required dosages were accounted for by percent organic matter and water content. The “active fraction” of organic matter, that fraction concerned with sorption equilibria, appeared to be of the same nature in soils of various compositions from various sources. This provided a technique for calculating the percent “active” organic matter of soil.

Type
Research Article
Information
Weeds , Volume 13 , Issue 3 , July 1965 , pp. 185 - 190
Copyright
Copyright © 1965 Weed Science Society of America 

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References

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