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Role of water table management in reducing metribuzin pollution
The role of water table management systems in reducing pollution from agricultural lands was investigated by measuring the mobility and degradation of metribuzin (4-amino-6(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one) in a three-year field lysimeter study. Nine large PVC lysimeters, 1 m long x 0.45 m diameter, were packed with a sandy soil. Three water table management treatments were used, consisting of two subirrigation treatments with constant water table depths of 0.4 and 0.8 m and a free drainage treatment. Metribuzin was applied in the summer months of 1993 to 1995. Soil and water samples were collected at different time intervals after each natural or simulated rainfall event, from the 0.45 and/or 0.85 m depth below the soil surface. The results from the three sampling seasons showed that the metribuzin concentration reduced with soil depth and time in all treatments. But, comparison of mass balance of metribuzin levels in the three treatments showed a significant reduction in the 0.4 m subirrigation treatment. The shallower water table in the 0.4 m subirrigation treatment seems to have provided more favorable moisture conditions in the crop root zone; thus enabling the soil biomass, to degrade metribuzin faster.
Role of water table management in reducing metribuzin pollution
The role of water table management systems in reducing pollution from agricultural lands was investigated by measuring the mobility and degradation of metribuzin (4-amino-6(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one) in a three-year field lysimeter study. Nine large PVC lysimeters, 1 m long x 0.45 m diameter, were packed with a sandy soil. Three water table management treatments were used, consisting of two subirrigation treatments with constant water table depths of 0.4 and 0.8 m and a free drainage treatment. Metribuzin was applied in the summer months of 1993 to 1995. Soil and water samples were collected at different time intervals after each natural or simulated rainfall event, from the 0.45 and/or 0.85 m depth below the soil surface. The results from the three sampling seasons showed that the metribuzin concentration reduced with soil depth and time in all treatments. But, comparison of mass balance of metribuzin levels in the three treatments showed a significant reduction in the 0.4 m subirrigation treatment. The shallower water table in the 0.4 m subirrigation treatment seems to have provided more favorable moisture conditions in the crop root zone; thus enabling the soil biomass, to degrade metribuzin faster.
Role of water table management in reducing metribuzin pollution
Jebellie, S.J. (author) / Prasher, S.O. (author)
Transactions of the ASAE ; 41 ; 1051-1060
1998
10 Seiten, 23 Quellen
Article (Journal)
English
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