琉球列島のサトウキビ畑における雑草の生理・生態 : 第5報タチアワユキセンダングサの種子の発芽に及ぼす諸要因の影響

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Physiological and ecological characteristics of Bidens pilosa L. var, radiata Scherff. a serious, dimorphic perennial weed of Compositae occurring in sugarcane fields, were investigated in an effort to establish effective measures of control. This first run of experiments were carried out for both long and short achenes. The results are as follows: 1. In achenes which were air-dried indoors for a period of 10 days after collecion and then stored in a desiccator for a period of 20 days at room temperature, germination under light conditions was enhanced at 25-35℃ and suppressed at 10℃. Germination under dark conditions was suppressed at 30-40℃ and enhanced at 10-20℃. Germination percentage was higher in long achenes than in short achenes (Fig. 3). 2. In achenes which were air-dried indoors for a period of 10 days after collection and then stored in a desiccator for a period of 9 months at room temperature, the same results as those described above were obtained for germination under light conditions. The difference was that germination under dark conditions was suppressed slightly at 10℃ and approximately the same results as under light conditions were obtained for germination at 20℃ (Fig. 4). 3. Light wavelength had a distinct effect on germination. Exposure to green light severely suppressed germination of both long and short achenes (Fig. 5). 4. In both long and short achenes, emergence decreased with the increase of soil depth. At a depth of 10cm no emergence was observed (Fig. 6). 5. In both long and short achenes, the germination percentage increased at higher moisture intensities. At a relative humidity of 37.5%, no germination was observed(Fig. 7).
日本雑草学会の論文
1985-12-21

琉球列島のサトウキビ畑における雑草の生理・生態 : 第5報タチアワユキセンダングサの種子の発芽に及ぼす諸要因の影響

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琉球列島のサトウキビ畑における雑草の生理・生態 : 第5報 タチアワユキセンダングサの種子の発芽に及ぼす諸要因の影響

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琉球列島のサトウキビ畑における雑草の生理・生態 : 第5報タチアワユキセンダングサの種子の発芽に及ぼす諸要因の影響