イネおよびヒメタイヌビエのほ場集団の乾物生産 : I単植条件

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The dry matter production in the populations of rice plant and barnyardgrass in single planting was studied in paddy fields for several years in 1972〜1979. The experiments were conducted in paddy fields of the institute. Late in June, seedlings (15cm height) of rice plant and barnyardgrass were planted with one plant per hill in 9m2 area for one plot. The planting densities were two levels; 6. 7 (sparse) and 11.7 (dense) stands per square meter. Late in September, rice plants and barnyardgrass were reaped and dried in air. In general the dry matter weight of rice plant and barnyardgrass in each year changed in parallel. However in the increase or the decrease of the dry matter weight in every year, barnyardgrass showed larger values than rice plant in the both density levels. The relations between air temperatures at 9:00 and the ratio of dry matter weight/daily solar radiation (from July to the middle ten days of September) were showed by the curves of parabola, possessing the peak at 27'C alike in the sparse and dense density levels. This ratio of barnyardgrass was larger than that of rice plant in the heigher temperature than 25. 7℃. In the range from 25.7℃ to 27℃, the difference of the ratio of barnyardgrass and rice plant became larger and at 27℃ the difference was largest. However in the lower temperature than 25.7℃, this relation reversed; the ratio of rice plant was larger than that of barnyardgrass. This means that the dry matter production of barnyardgrass, C_4 plant, is inferior to that of rice plant, C_3 plant in the cooler summer.
日本雑草学会の論文
1981-12-26

イネおよびヒメタイヌビエのほ場集団の乾物生産 : I単植条件

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