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Soil Sterilization Properties of Monuron, Diuron, Simazine, and Isocil

Published online by Cambridge University Press:  12 June 2017

R. P. Upchurch ,
J. A. Keaton  and
F. L. Selman
R. P. Upchurch
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, North Carolina
J. A. Keaton
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, North Carolina
F. L. Selman
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, North Carolina
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Abstract

Under field conditions in North Carolina, yearly retreatment was required to provide reasonable soil sterility when an initial rate of 40 lb/A was used for each of the compounds 3-(p-chlorophenyl)-1,1-dimethylurea (monuron), 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron), and 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine). Lateral movement of these three herbicides was a major factor limiting their utility as soil sterilizers. Attempts to reduce lateral movement by using reduced herbicidal rates in combination with contact active additives were partially successful. The total soil sterilization performance index derived from sterility ratings and lateral movement ratings indicated that the combination of 5 lb/A of diuron and 2 lb/A of 1,1′-dimethyl-4,4′-bipyridinium salt (paraquat) could not be excelled by diuron or 5-bromo-3-isopropyl-6-methyluracil (isocil) regardless of the rate used. When used alone, the soil sterilization properties of diuron were equivalent to those for isocil, provided that the diuron rates were two and one-half times as great as those for isocil.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 3 , July 1968 , pp. 358 - 364
Copyright
Copyright © Weed Science Society of America 

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References

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