| Project/Area Number |
02660242
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業土木
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| Research Institution | Faculty of Agriculture, Kyushu University |
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Principal Investigator |
NAKANO Yoshisuke Faculty of Agriculture, Kyushu University, Accociate Professor, 農学部, 助教授 (60038320)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Micro irrigation / Irradiation / Water consumption / Heat balance / Row crop / Wetted surface / Water potential / Soil surface evaporation |
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| Research Abstract |
To evaluate the consumptive use efficiency of irrigated water. it is interest to estimate the soil surface evaporation component separately from transpiration component. When the fields are irrigated by microirrigation systems. wetted area are formed on the soil surface. Estimating evaporation rate from the wetted spots are important to quantify the water for irrigation.
Two approaches were pursued on this project. Firstly. vapor diffusion mechanism in the binary layer on the soil surface was experimentally examined. Evaporimeter made with thin plaster layer was observed to give good estimation. Secondary. the mechanism of water diffusion in the the vicinity of soil surface was examined. Using an equipment to measure soil water potential, distribution of volumetric soil water contents during the fallen rate stage of drying in the surface layer were observed. Water flow rates determined with this observation were compared with calculated results of summation model. With this technique, water diffusivity in the surface layer were precisely investigated.
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