水田水稲作におけるPCPの施用法と流亡,消失

概要

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In order to obtain basic information for creating the way of alleviating the toxicity of PCP granule to fish and shell-fish, we have performed the investigation about distribution and persistence of PCP granule in water and soil in cases of some different application methods on transplanted rice paddy fields in 1964. PCP granule incorporated into soil before transplanting of rice seedlings remained longer and more deeply distributed in soil than one applied on the surface of soil after transplanting. This tells us that the incorporation method should be more effective in protecting fish and shell-fish from toxicity that may occur owing to a heavy rainfall. On the other hand, effect of weeding was found to be highest in a case where PCP was incorporated into soil at the time of rough-puddling before transplanting, but the damage of rice seedlings and their recovery was found to be lighter and faster, respectively, in a case of surface application after transplanting, than in other methods. Generally speaking, the most suitable application method of PCP granule or PCP and fertilizer mixtures should be taken into consideration from two points of veiw; first, security to fish and shell-fish and, secondly, effectiveness as a herbicide.
日本雑草学会の論文
1969-08-30