琉球列島のサトウキビ畑における雑草の生理・生態 : 第6報タチアワユキセンタングサの生育と種子生産に及ぼす窒素・遮光・土壌水分の影響

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The effects of nitrogen application, shading and soil moisture on the growth and seed production of Bidens pilosa L. var. radiata Scherff., an aggressive perennial sugarcane weed in the Ryukyu Islands, were investigated under laboratory conditions in order to provide physiological and ecological evidences for the effective control of the plant. The results are summarized as follows : 1. The leaf area, number of offshoots and number of capitula increased considerably with increasing nitrogen level. A similar tendency was noted in the main stem length, root weight, T/R ratio, top dry matter weight, achene weight per capitulum and 1,000 kernel weight. The days to flowering decreased with increasing nitrogen level (Fig. 1-3, Table 1-2). 2. The main stem length, leaf area and T/R ratio increased considerably as the shade intensity was increased. The top dry matter weight showed a similar tendency, while the root weight, number of capitula and top dry matter coefficient decreased considerably. A similar tendency was noted in the number of offshoots, achene weight per capitulum and 1,000 kernel weight, while the days to flowering increased as the shade intensity was increased (Fig. 4-6, Table 3-4). 3. The T/R ratio and top dry matter coefficient increased with increasing moisture intensity, while the number of offshoots, achene weight per capitulum and 1,000 kernel weight decreased. The top dry matter weight, root dry matter weight and number of capitula also decreased to a marked degree. The main stem length increased most in the 42% treatment. Flowering took place earlier at higher moisture intensities (Fig. 7-8, Table 4-7). 4. As has been observed, this weed is characterized by the fact that its growth is promoted at higher nitrogen levels, at higher shade intensities and also at lower moisture intensities. It is accordingly concluded that the weed can infest any sugarcane field where nitrogenous fertilizer is used in large quantities, the crop provides sufficient shading and in addition, the soil is less moist. For effective control, it is suggested that the weed should be removed while it is still in its early stage of growth.
日本雑草学会の論文
1986-05-26

琉球列島のサトウキビ畑における雑草の生理・生態 : 第6報タチアワユキセンタングサの生育と種子生産に及ぼす窒素・遮光・土壌水分の影響

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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6報 タチアワユキセンタングサの生育と種子生産に及ぼす窒素・遮光・土壌水分の影響

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スポンサーリンク

琉球列島のサトウキビ畑における雑草の生理・生態 : 第6報タチアワユキセンタングサの生育と種子生産に及ぼす窒素・遮光・土壌水分の影響