グレインソルガム畑の雑草防除に関する研究 : 2.雑草害の様相と除草必要期間の実証

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Experiments on the competition of weeds with grain sorghum (Sorghum bicolor (L.) Moench) in relation to changes in the weeding period were conducted to determine whether the interval between weedings which had been established in a previous report was appropriate. 1. Plant lenght of Digitaria ciliaris (Retz.) Koeler in the plot without weeding reached the upper part of crop canopies when relative light intensity was less than 10%, whereas in the plots where weeding intervals after seeding ranged from 20 to 40 days the plant length reached only the lower part of crop canopies. 2. The ratio of weed weight to total plant community weight was large in the plot without weeding while in the plots where weeding intervals ranged from 20 to 40 days, the ratio was below 4 %. 3. At harvest a large amount of weeds remained in the plot without weeding while a small quantity of weeds remained in the plots where weeding intervals ranged from 20 to 40 days. 4. In the plot without weeding dry weight of plant and grain weight were reduced along with fodder dry weight. Crop yield reduction associated with weed growth did not occur in the plots where weeding intervals ranged from 20 to 40 days. 5. Based on these results and in taking into account the meteorological conditions during the year when the experiments were conducted, it appeared that a weeding interval of approximately 26 days after seeding was appropriate and enabled to avoid crop yield reduction associated with growth.
日本雑草学会の論文
1983-08-05

グレインソルガム畑の雑草防除に関する研究 : 2.雑草害の様相と除草必要期間の実証

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