抄録
For the weed control in the plastic mulching culture, authors contrived "Herbicidal Film" which was made polythylene films mixed, coated or printed with herbicides. Mixed ones were formed after having been mixed herbicides with source solution of polyethylene. 1. The mixed or coated herbicidal films were more effective for weed control than printed ones, no clear difference was recognized between the mixed herbicidal films and the coated ones, both were excellent. 2. The sorts of effective herbicides for herbicidal films were those which display their actions with being absorbed and translocated by plants, and those which display their actions with contact on plants were non-effective. The matter above mentioned was due to the fact that almost herbicides melted out from the films and get into active during a day after mulching. 3. It is said that less doses of herbicides are required on mulching culture than common culture, because of higher soil temperature, much soil moisture and uniform emergency of weeds under the films. With an experiment on the herbicidal films, the same result as that of above mentioned were obtained. So comparing with the common culture, about two-thirds doses of herbicides used for herbicidal films were as effective as those of common. And more doses may cause the injury of crops.
