Studies on a Herbicide, 2-(α-naphtoxy)-N, N-diethylpropionamide (R-7465)

(2) The Mixing Effect of R-7465 with Simetryne

Abstract

(1) The synergistic effect of R-7465 and simetryne was recoganized for barnyardgrass. The most adequate combination rate, R-7465 to simetryne was from 2:1 to 2:2.7. On the other hand, the most adequate combination for some weeds, R-7465 to simetryne was 2:1.5.
(2) The selectivity of the formulated granules which contain both of R-7465 and simetryne (mixing ratio 2:1 and 2:1.5) was examined. In consequence, the treatment of between 6g+3g and 10g+7.5g per are showed the fine control for all of weeds and no injury for transplanted riceplants.
(3) It was appeared that the persisteace of R-7465-simetryne combination in soil is 100 days for treatment of 6g+3g per are.
(4) The low rate of R-7465-simetryne, such as 6g+3g to 10g+5g per are, gave no influence for oat, cucumber and crucifer planted after harvest of rice. But the treatment of more than 15g+7.5g per are gave injuries for oat particularly.