高地温が甘藷の生育に及ぼす影響

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1) Effects of high soil temperatures on the growth of sweet potato plant was investigated using soil thermostats at 32℃, 27℃ and 23℃. The higher the soil temperature, the greater was the growth of vines. But, at 32℃, the growth of tuberous roots became poor, and some varieties tested did not produce any roots at all, and there was no difference between the results by 27℃ and those by 23℃. So, the authors concluded that the optimum soil temperature for the growth of sweet potato plant ranges from 20℃ to 30℃, and temperatures above 30℃ are inappropriate for it. 2) The soil temperature was kept at 25℃ in the daytime (a.m. 8.00 p.m. 6.00) and at 31℃ in the night, and reversely at 31℃ in the daytime, and at 25℃ in the night. As a resuet of this test, high soil temperature in the night was proved to be a crucial factor for the growth. 3) The relation of the growing period to the high soil temperature (31℃) was examined, and it was found that the effects of the high soil temperature for 20 days after transplanting were not so remarkable for the growth of the tuberous roots of sweet potato, but the sametemperature after this period was crucially important. 4) It is known that the soil temperature at the late-planted fields is usually high above 30℃ for about one month after the rainy season, and moreover, the high soil temperature prevails during the night for this period, and it is also confirmed that straw mulching is efficacious on late-planted sweet potato fields. Therefore, from the above points of view, it may be reasoned that the main cause of reduceds yields of sweet potatoes planted late is due to the high soil temperature.
日本作物学会の論文
1957-09-20

高地温が甘藷の生育に及ぼす影響

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