Author:
Banks Philip A.,Robinson Edward L.
Abstract
The presence of a straw mulch on the soil surface did not significantly affect the persistence of metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5 (4H)-one] in the soil. The half-life of metribuzin was 5.3 days in 1979 and 12.5 days in 1980 in the field when the time the herbicide was exposed on the soil and straw surface prior to rainfall or irrigation was 10 and 0 days, respectively. The half-life of metribuzin was 17.1 days in the greenhouse where soil temperature was lower and leaching, volatilization, and photodegradation losses were less than in the field. Increasing the amount of straw on the soil surface greatly decreased the initial soil reception of metribuzin as well as the amount of metribuzin that was subsequently washed off the straw by water. Less than 45% of the applied metribuzin reached the soil surface when 2250 kg/ha of straw was present and 0.3 cm or more of water was applied.
Publisher
Cambridge University Press (CUP)
Subject
Plant Science,Agronomy and Crop Science
Reference9 articles.
1. Metribuzin persistence on the soil surface;Savage;Proc. South. Weed Sci. Soc.,1980
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3. Effect of wheat straw and ash on field activity of preemergence herbicides;Steinsick;Proc. South. Weed Sci. Soc.,1979
4. Disappearance of s-triazines as affected by soil pH using a balance sheet approach;Best;Weed Sci.,1974
5. Effect of soil pH on microbial degradation, adsorption, and mobility of metribuzin;Ladlie;Weed Sci.,1976
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