Triazine Persistence in Soil in Eastern Ohio
1978
Nearpass, D. C. | Edwards, W. M. | Taylor, A. W.
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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