Abstract
The release rate of hexazinone (3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione) applied as a surface coating on a new granular formulation, Pronone 10G, was determined by means of gas chromatography. The area under study was a 3-year-old forest cutover. The exposed granules were retrieved from the field 1, 2, 3, 4, 7, 8, 13, 18, 34, and 37 days after field application. Percent release of hexazinone was 26, 31, 36, 44, 91, 98, 99, 99, 100, and 100%, respectively, at 0.25, 0.25, 0.25, 0.51, 11.7, 11.9, 12.2, 26.2, 104, and 106 mm of cumulative rainfall. Multiple regression analysis showed that percent release of hexazinone depended on cumulative rainfall as well as on the length of the exposure period (the multiple correlation coefficient (R) was 0.94). A table of estimates was derived from the multiple regression for determining the days of exposure required to achieve different levels of release of hexazinone after 0.25–25 mm of cumulative rainfall.
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