畑作物の雑草害に関する研究 : V.トウモロコシと雑草との競争過程の生長解析

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In this report we analysed the mechanisms of competition between corn and weeds on the base of the growth increment, the seasonal change of growth factors, and clarified the growth retarding ability of corn to weeds. Results obtained are as follows: 1) The correlations between nitrogen content (%) and crop growth rate (CGR) were observed in leaf blade and whole top of corn plant from middle growing stage to late growing stage. 2) The correlations between N% of top and leaf area index (LAI) were observed from middle growing stage to late growing stage. However, LAI was greater in weeding plots than not-weeding plots under similar N o/o level of leaf. 3) The relation between net assimilation rate (NAR) and N% differed in the treatment from middle growing stage to late growing stage. The nitrogen content values in which the maximum of NAR was obtained from late growing stage to harvest stage. The values were almost same on weeding plot and not-weeding plot. 4) The growth retarding to weed by corn was confirmed at late stage (53 days). However, it decreased at harvest stage on all treatment plots, therfore the weeds grew vigorusly again in this stage. 5) CGR of weeds increased largely at early growing stage. CGR from early stage to middle growing stage was similar in corn and weeds, and was influenced by fertilizer application. 6) It is considered that the growth retarding ability to weeds in the corn field is resulted from light competition more than nutrient absorption.
日本雑草学会の論文
1980-12-25

畑作物の雑草害に関する研究 : V.トウモロコシと雑草との競争過程の生長解析

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