ウラシル系除草剤に関する研究 : 第1報 5-bromo-3-butyl-6-methyluracilの作用特性について

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These studies were conducted to obtain some informations on the herbicidal properties of the two uracil derivatives, such as 5-bromo-3-n-butyl-6-methyluracil (S-113) and 5-bromo-3-iso-butyl-6-methyluracil (S-114). (1) Both chemicals, S-113 and S-114, showed higher selectivity than bromacil for leguminous crops on pre-emergence treatment in green house. The descending order of the selectivity of S-113 among them was shown as pea=azuki bean>soy bean>kidney bean. And that of S-114 was shown as pea>azuki bean>soy bean>kidney bean. (2) These chemicals showed low selectivity and phytotoxicity less than pre-emergence treatment on post-emergence treatment. The descending order of the selectivity of S-113 was shown as pea>kidney bean>azuki bean≧soy bean, and that of S-114 was shown as pea=kidney bean=soy bean>azuki bean. (3) In the field test, high adaptability were recognized as the pre-emergence treatment under 5g per are for soy bean, azuki bean, peanut and pea. In case of S-114 it was only pea plant. (4) The relation between soil humidity and selectivity for crops was found to be fairly important. The selectivity decreased according to increase of soil humidity. As usually soil humidity in bean fields is 65 to 75%, these chemicals keep their selectivity even such condition. (5) The movement in soil of S-113 and S-114 were less than bromacil, and the downward movement was from 2.5 to 4.5cm in silty clay loam soil, and from 6.5 to 9.5cm in sandy clay soil. (6) The persistence in soil, both S-113 and S-114 were much stable as same as bromacil. The day for 50% decomposition of these chemicals were 70 to 80 days in sandy clay soil. (7) Both S-113 and S-114 were much stable as same as bromacil to the decomposition by ultraviolet rays.
日本雑草学会の論文
1979-10-25

ウラシル系除草剤に関する研究 : 第1報 5-bromo-3-butyl-6-methyluracilの作用特性について

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