数種除草剤が水稲に及ぼす形態的影響とジメピペレートの薬害軽減効果 : 第3報異なる土壌あるいは処理薬量条件におけるフェチノチオール・シメトリンとそのジメピペレート混合剤の形態的影響の変動

概要

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Effects of phenothiol-simetryn mixture application on rice morphology and safening by combination with dimepiperate were investigated with different types of paddy soils and with different doses of herbicides. Experiments were conducted by using three kinds of soils. The doses used were the same as those described in the previous report. 1) Effects of phenothiol-simetryn and dimepiperate mixtures on rice shoots were not conspicuous except for the expansion of rice hills, and there was no difference between the effects of the two herbicides. 2)Morphological effects on rice roots included various abnormalities of crown roots, which bended or were enlarged in the basal portion. Morphologically affected roots involved mainly the lower roots of the 8th shoot unit and others around them. 3)Morphological effects on rice roots were more severe in plots with a mixture of sand and clay loam and sandy loam than on those with clay loam. In the case of clay loam, more severe morphological effects on rice roots appeared at 600g/a than at the standard dose of 300g/a of commercial herbicides. 4)Safening effect on rice of the application of phenothiol-simetryn in combination with dimepiperate was appreciable a little in relation to the number and the degree of morphological abnormalities of roots.
1989-10-30