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Effect of Soil Constituents on Herbicide Activity in Modified-Soil Field Plots

Published online by Cambridge University Press:  12 June 2017

J.B. Weber ,
S.B. Weed  and
T.W. Waldrep
J.B. Weber
Affiliation:
Crop Sci. and Soil Sci., Soil Sci., North Carolina State Univ., Raleigh, NC 27607
S.B. Weed
Affiliation:
Crop Sci. and Soil Sci., Soil Sci., North Carolina State Univ., Raleigh, NC 27607
T.W. Waldrep
Affiliation:
Eli Lilly and Co., Greenfield, IN 46140
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Abstract

An organic muck and a montmorillonite clay were incorporated into the surface 7.6 cm of a structureless sandy soil at rates ranging from 26,880 to 89,600 kg/ha. Prometryne [2,4-bis(isopropylamino)-6-(methylthio)-s-triazine] and fluometuron [1,1-dimethyl-3-(α,α,α-trifluoro-m-tolyl)urea] were surface-applied and trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) were incorporated at two rates each in 1968, 1969, and 1970. Organic matter greatly reduced the biological activity of all three herbicides. Montmorillonite clay greatly reduced the activity of prometryne, slightly decreased the activity of fluometuron, and had no significant effect on trifluralin activity in all but the first year of the study. Both soil additives increased the cation exchange capacity of the soil. Muck decreased soil pH while montmorillonite increased it.

Type
Research Article
Information
Weed Science , Volume 22 , Issue 5 , September 1974 , pp. 454 - 459
Copyright
Copyright © 1974 by the Weed Science Society of America 

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References

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