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This article in AJ

  1. Vol. 70 No. 6, p. 937-940
     
    Received: Nov 19, 1977
    Published: Nov, 1978


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doi:10.2134/agronj1978.00021962007000060011x

Triazine Persistence in Soil in Eastern Ohio1

  1. D. C. Nearpass,
  2. W. M. Edwards and
  3. A. W. Taylor2

Abstract

Abstract

Degradation rates of triazine herbicides, following application for weed control, were measured to evaluate their persistence in Eastern Ohio soils under no-tillage and conventional corn management systems.

Atrazine [2-chloro-4(ethylamino)-6-isopropylamino-s-triazine] degradation in the field was compared with that found in laboratory measurements on the same soil. The reaction showed first-order kinetics, but in the field the rate constant varied being faster in summer and slower in the early fall. Simazine [2-chloro-4,6-bis-(ethylamino)-s-triazine] degradation in the field showed similar characteristics. Under conventional and no-till managements both chemicals degraded through three or four half-lives during the 160-day growing season. Under similar pH conditions, the presence of a surface mulch did not affect the degradation rate.

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