The influence of chemical and biochemical properties on the herbicidal efficiency of 3-cyclohexyl-5, 6-trimethylene uracil and 2-bromo-6'T-butyl-o-acetotoluidide Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/v979v599f

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  • Application of herbicides to the soil has become an important factor in the production of row crops. Economic production of sugar beet (Beta vulgaris), an important row crop, requires efficient methods of weed control. Two experimental herbicides, 3-cyclohexyl-5,6-trimethylene uracil (DP634) and 2-bromo-6't-butyl-o-acetotoluidide (CP32179), had shown promise in sugar beet screening trials. This study was set up to investigate the chemical and biological properties of DP634 and CP32179. Field application of these herbicides was studied under five methods of incorporation - discing, tine tilling, sweep application, rotovation and surface application The trial was established on fall seeded sugar beets in the Willamette Valley. A comparison was made between two methods of evaluating weed control data. using the ultra-violet absorbing properties of DP634, a spectrophotometric method of analysis was developed for this compound. Solubility of DP634 in water was found to be 4.5 p.p.m. at 20°C. The herbicide was found to have a positive heat of solution. A saturated aqueous solution of CP32179 inhibited germination of perennial ryegrass (Lolium perenne) and sugar beet. A similar solution of DP634 did not inhibit germination. In the field trial, rotovating two pounds of DP634 into the soil gave most efficient control of ryegrass and least damage to sugar beets in a fall seeded situation in the Willamette Valley. Two pounds of CP32179 gave less efficient ryegrass control under these conditions. Visual estimations of crop and weed damage was shown to be less time consuming and more precise in this trial than collecting quantitative data.
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