1992 Fiscal Year Final Research Report Summary
Procedure for Saving Water Application and Irrigation Scheduling
| Project/Area Number |
02454086
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | KYUSHU UNIVERSITY |
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Principal Investigator |
KURODA Masaharu Kyushu Univ., Fac. of Agr., Prof., 農学部, 教授 (50039319)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Tetsuro Kyushu Univ., Fac. of Agr., Assis. Prof., 農学部, 助手 (30140627)
TANAKA Akira Saga Univ., Fac. of Agr., Assoc. Prof., 農学部, 助教授 (70038305)
HAYASHI Shizuo Kyushu Univ., Center of Trop. Agr., Assoc. Prof., 熱帯農学研究センター, 助教授 (00038316)
NAKANO Yoshisuke Kyushu Univ., Fac. of Agr., Assoc. Prof., 農学部, 助教授 (60038320)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Water planning / Saving water irrigation / Soil moisture / Water requirement / Irrigation schduling / Irrigation system / Pressure regulation / Discharge regulation |
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| Research Abstract |
There are several factors for water saving irrigation, for example, effective use of rainfalls, continuous use of upward flux from sub-soil and so on.
In this research, the investigations were carried on for establishing the suitable irrigation schemes such as irrigation scheduling and irrigation system operation concerning factors of saving water. Finally,the water planning technics were proposed and discussed.
Obtained results are as follows.
(1) Water requirements were established using daily intake water into irrigation system by a reverse calculation of the TRAM method. The time series of irrigation operation were defined by two variables ie. the amount and the time of water application. An optimized evaluation method of water requirements was achieved with introducing an suitable objective function.
(2) The two layer model for simulating the upward moisture flux from sub-soil to root zone. The obtained results were varified by field tests on the Kuroboku soil.
(3) It is tried to evaluate individually both evaporation rate and transpiration rate from planted fields.
(4) The reasonable irrigation scheduling methods were proposed conbining the developed technics on each factor above mentioned.
(5) In addition, new regulation technics of hydraulic pressure and discharge were presented for suitable oparation of sprinkler system and micro irrigation system.
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