除草剤,主としてprometryneの作用力の温度による変動要因の一考察

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In the previous paper, we have reported that the effect of a high temperature on the phytotoxicity of herbicides was the greatest in prometryne out of 7 root-applied herbicides tested. Then, this study has been carried out in attempt to consider the factor of variation on the phytotoxicity of prometryne as influenced by temperature and to learn the degree of its variation of 9 s-triazine herbicides. The phytotoxic action of prometryne was influenced more by a high temperature than by a soil one. The downwards movement of prometryne into the soil was not increased by raising the temperature. Furthermore, in order to learn the relation of air humidity and temperature on the phytotoxicity of prometryne, the effect of prometryne on the transpiration rate of rice seedlings, and the relationship between the period and duration of high temperature treatment and the phytotoxicity of prometryne, a several number of experiments have been conducted, using rice seedlings grown in sand and solution cultures with prometryne. As a result, it could be presented that the relation of a high temperature to the phytotoxicity of prometryne on rice seedlings should be considered in relation to the following three factors: 1) change in the pattern of prometryne uptake, which is mainly depending on transpiring stream, probably characterized by rapid absorption of prometryne soon after treatment, 2) increase in the physicochemical reaction of prometryne against plans cells under a high temperature, and 3) change in the physiological and biochemical states of rice seedlings (see Fig. 3). Increasing in the phytotoxic action of s-triazine herbicides by a high temperature was clearly different according to the kind of substitutes in a triazine ring, Namely, it was greater in order of -OCH_3,-SCH_3, and -Cl in the 2 position of a triazine ring (R_5 in Fig. 2), and tended to be greater in isopropyl than ethyl in the 4 and 6 positions (R_2, R_4 in Fig. 2).
日本雑草学会の論文
1968-12-25

除草剤,主としてprometryneの作用力の温度による変動要因の一考察

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