Graduate Thesis Or Dissertation

 

Factors influencing the herbicidal activity and persistence of isomers of 1, 1-dimethyl-diisopropyl-indanyl ethyl ketone in soil Public Deposited

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  • The purpose of this study was to evaluate the activity of Sindone (isomers of 1, 1-dimethyl-diisopropyl-indanyl ethyl ketone) under field conditions and to gain information regarding the rate of detoxification of Sindone in soil. A series of trials were established in sugar beet fields in California, Oregon, and Washington. Sindone was applied as a pre-plant treatment, power incorporated to a depth of 1.5 inches, at rates of 0, 1.5, and 3.0 lb /A active ingredient, and followed by sprinkler or furrow irrigation. The toxicity of Sindone to emerging sugar beets and seedling grasses was recorded. Yield data were collected where possible. Incorporated Sindone gave good grass control at rates of 1.5 to 3.0 lb /A when irrigated after application. Areas that received no irrigation within four weeks after application showed no visible weed control. Rates of Sindone that gave good grass control injured sugar beets. A series of greenhouse experiments were conducted to study the detoxification rate of Sindone in soil. The rate of detoxification was determined at soil moisture levels of 47%, 77%, and 102% field capacity. Treated soils were stored at -18, +5, +25, and +35°C. Barnyardgrass (E. crusgalli) was used as the bioassay species. The rate of detoxification was greatest at the 77% moisture level and at 35°C. Sindone degradation rates were also determined in eight agricultural soil types stored at +25°C. The rate of detoxification indicated a half-life for incorporated Sindone under these conditions of approximately six months. The results of this study indicate that Sindone offers little promise as a sugar beet herbicide because of lack of selectivity. However, the long half-life indicates potential usage in perennial crops or in turf weed control. Bioassay results indicate a strong possibility that phytotoxic metabolites are formed in the degradation process.
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