フェノキシ系除草剤が水稲の生育に及ぼす影響 : 第1報MCPが茎葉の発育に及ぼす影響

概要

論文の詳細を見る
This study was carried out to examine the morphogenetic effect of MCPA-ethyl on transplanted young rice plants. MCPA-ethyl was applied in all of the experiments, at the rate of 3g a. i. /a. The results are summarized as follows; 1) The leaf-emergence rate in the main stem was not influenced by the MCPA-ethyl application regardless of the plant age or environmental conditions. Even in the case of tubular leaf formation by the chemical, the leaf-emergence rate was not affected until the tubular leaf extended completely. 2) The leaf abnormality was observed in the fourth through sixth leaves counted from the leaf extended perfectly at the time of the MCPA-ethyl application. The abnormal leaves were induced in the developmental stages of leaf primordium which appeared at the foot of the shoot apex and began to cover the shoot apex like a hood at the time of the chemical application. 3) The number of tillers decreased by the MCPA-ethyl application. The node order of tillers which suffered serious_ hindrance at the time of application was the top node and the next one. 4) The most severe effect of MCPA-ethyl on the growing point was to stop leaf primordia formation temporarily. However, almost all of primordias recovered gradually as soon as the effect of the MCPA-ethyl was lost. As a result, the MCPA-ethyl applied plants had many tillers of the higher node order and third tillers compared with the untreated plant.
日本雑草学会の論文
1978-08-25