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- W2327777627 abstract "In this paper the author described mainly the specil quality of peat-bog and considerated the method of researches on the duty of water. Observations were carried out at the experimental rice-fields at Iwamizawa, Bibai and Kotoni in Hokkaido. Duty of water was counted every decade from percolation, evaporation and transpiration.Evapotation and transpiration were estimated by formulae (1)-(5) from fall of water in some pots in the rice field; in half the number of the pots were soil, water and two rice-plants and in the other were only soil and water.Apparent percolation was taken as the difference between fall of water in the rice-field and evaporation from the rice-field surface, and leakage of water through the raised foot-path between rice-fields was eliminated by measuring percolation with a cylinder without bottom. For instance, the more water in irrigation canal decreased the more the apparent percolation in the rice-field increased, on the contrary the more the water increased the more the percolation decreased, because the apparent percolation included leakage of water through the raised foot-path between rice-fields. When the percolation was maximum, that is, when the water in the irrigation canal was minimum, true percolation (in vertical direction) was 2/3 the volume of the apparent percolation. The maximum percolation decreased gradually as the ground became hard (Fig. 2). Percolation also was affected by the ground water level. In Fig. 3 as the culvert was closed at relief well, the lower parts of the rice-fields had higher level of ground water, and at (5) (Fig. 3) water leaks to the farm at a great rate and it seemed that the lowest part of the rice-field adjoinning a farm had a considerably lower ground water level." @default.
- W2327777627 created "2016-06-24" @default.
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- W2327777627 date "1953-01-01" @default.
- W2327777627 modified "2023-09-26" @default.
- W2327777627 title "Researches on duty of water in the rice-field of peat-bog" @default.
- W2327777627 doi "https://doi.org/10.2480/agrmet.9.7" @default.
- W2327777627 hasPublicationYear "1953" @default.
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