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Effects of Soil Acidity on the Adsorption, Penetration, and Persistence of Simazine

Published online by Cambridge University Press:  12 June 2017

D. C. Nearpass
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Abstract

In 1:1 slurry, adsorption of 2-chloro-4,6-bis (ethylamino)-s-triazine (simazine) by acid soils from saturated solution varied from 13 to 90%. Percent of adsorption from more dilute solutions was approximately that from the saturated solution. The adsorption of simazine by 18 soils was not correlated significantly with soil pH, but was correlated significantly with percent clay and highly significantly with organic matter and titratable acidity. Simazine was considered to be adsorbed by soils by proton association. Using titratable acidity as a measure of H-soil, equilibrium constants were calculated which did not vary greatly as a result of changes in acidity up to pH 8.5, or as a result of concentration of simazine in the added solution. Leon, the most adsorptive of the tested soils, gave values for the equilibrium constant that were somewhat higher than for four other soils. Simazine penetrated more deeply into limed soil than into unlimed soil. Liming reduced the decomposition of simazine as did intermittent drying. Recovery decreased with time.

Type
Research Article
Information
Weeds , Volume 13 , Issue 4 , October 1965 , pp. 341 - 346
Copyright
Copyright © 1965 Weed Science Society of America 

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References

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