The Effect of Watering of Cold Water on the Soil Temperature of Pot and the Growth of Cyclamen.
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概要
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The authors conducted some experiments from 1978 to 1983, to make clear the effect of watering by could water (10°C) upon the growth of cyclamen (Vuur-baak) cultivated under same conditions every year.The results obtained are summarized as follows.1. The summer in 1978 was very hot and in 1980 was very cool.2. In 1978, the soil temperature at 5cm of cyclamen pot dropped remarkably after watering by cold water, The number of days that the difference between before and after watering overed 10°C, was 16 days in July, 27 days in August and 6 days in September, The temperature of city water fluctuated every day according to the air temperature and to the total amount of claudiness in Ikuta.3. In 1980, the number of days abovementioned was only 3 days in August in Ikuta.4. The results of hourly observation for 15-16 August 1978 and for 8-9 August 1983 in Ikuta revealed that watering by could water at 12:30 falled markedly the maximum of soil temperature.5. In Ikuta, the fresh leaves and flower buds of cyclamen were superior at the plot of water in 1978 and no differences observed in 1980.6. In Fuchu, no significant differences were observed on these characters of cyclamen at both plot every year. The source of water supply at the Experimental Farm is so deep that the temperature of city water is low (about 15°C) in summer. Then it seems that no significant differences of the growth of cyclamen are according to the small difference of water temperature at both plots.
- 日本農作業学会の論文
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