グレインソルガム畑の雑草防除に関する研究 : 1.グレインソルガムの生育特性の解明と除草必要期間の設定

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In order to obtain fundamental data on weed control in grain sorghum (Sorghum bicolor (L.) Moench), we investigated on growth characteristics of grain sorghum and weeds. The results are as follows : 1) Plant length of grain sorghum about 60 days after seeding was larger than that of large crab-grass (Digitaria ciliaris (Retz.) Koeler), but that of the former was less than the latter on and after about 70 days after seeding. 2) High negative correlation was found between logarithum of relative light intensity on ground surface of interrow and the number of days after seeding in grain sorghum, and the regression line was obtained. From this regression line, the day when relative light intensity reduced under 10% was estimated, that is, about 56 days after seeding in grain sorghum. Growth of large crab-grass was greatly diminished at the condition of relative light intensity under 10%. 3) At the time when relative light intensity on ground surface of interrow reduced under 10%, the space of about 30cm-high from ground surface was kept the same value of relative light intensity in grain sorghum. 4) The linear regression was obtained between LAI of grain sorghum and the relative light intensity on ground surface of interrow. From this regression line, LAI at the time when relative light intensity reduced under 10%, was estimated at. 5.0. 5) From above results and the past data referring to the growth of large crab-grass, about 26 days after seeding was estimated as the period for weed-free maintenance in the community of grain sorghum and large crab-grass.
日本雑草学会の論文
1982-10-26

グレインソルガム畑の雑草防除に関する研究 : 1.グレインソルガムの生育特性の解明と除草必要期間の設定

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