Effects of Mowing and Uprooting on the Height and Density of Goldenrods (Solidago altissima L.) Plants

抄録

　Effects of frequency and time of mowing and/or uprooting on the average plant numbers per square meters (plant density) and plant height of Goldenrods (Solidago altissima L.) were investigated. In total eight treatments were tested: M5 (mowing in May), M10M5 (mowing in Oct. in the previous year and in May), M11M5 (mowing in Nov. in the previous year and May), M3M5 (mowing in March and May), U10M5 (uprooting in Oct. in the previous year and mowing in May), U11M5 (uprooting in Nov. in the previous year and mowing in May), U3M5 (uprooting in March and mowing in May), U5 (uprooting in May). The average plant density and plant height were measured in August. The results indicated that there were no statistically significant differences in the plant density among the treatments, except for M5 (the largest), suggesting that the plant density was not much affected by the time of mowing and/or uprooting. On the contrary, the plant height was more affected by the weeding methods (mowing or uprooting) and the time of weeding. The results also suggested that treatments including uprooting were more effective in reducing the plant height than mowing-only treatments. The most effective treatment among those tested was U10M5. Among mowing-only treatments, M10M5 was the most effective.