| Project/Area Number |
61860022
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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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, Tottori University |
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Principal Investigator |
YAMAMOTO Tahei Tottori University, 農学部, 助教授 (00032102)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Mitsuhiro Tottori University, 農学部, 助教授 (90032309)
HONNA Toshimasa Tottori University, 農学部, 助教授 (90093624)
KAMICHIKA Makio Tottori University, 農学部, 助教授 (20032310)
KITAMOTO Yutaka Tottori University, 農学部, 教授 (10032294)
YANO Tomohisa Tottori University, 農学部, 教授 (80032085)
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| Project Period (FY) |
1986 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 1988: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1987: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1986: ¥4,100,000 (Direct Cost: ¥4,100,000)
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| Keywords | saline irrigation / drip irrigation / soil management / leaching fraction / sub-irrigation / salt movement / nutrient movement / auto-radiography / 塩水潅漑 / 点滴潅漑 / 節水栽培 / 地中潅漑 / X線フィルム / リーチングフラックション / 水分プロフィル / 塩分プロフィル / RIトレーサー |
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| Research Abstract |
From the studies during 1986-1988, the results were summarized as follows.
1. Movements of moisture and salts under drip irrigation were discussed on the characteristics of (1) three-dimensional distribution in the dare sand field, (2) two-dimensional distribution in the bare sand field and (3) one-dimensional distribution in the root zone of sorghum.
2. Leaching experiments on cotton cultivation were carried out using lysimeters in grass-house. The leaching ratios of soil salts showed 40% and 60% under the conditions of leaching fractions of 0.16 and 0.18, respectively. The cotton yields with the saline irrigation of 3,500 ppm decreased below a half of those obtained with non-saline irrigation.
3. The movements of moisture and salts were discussed under the conditions of two irrigation methods of concentrated water supply and drip method, using the soil columns planted with vegetables in the growth cabinets. The drip method showed more efficient water use and higher salts concentration in the main root zones during active transpiration stage in a day.
4. The methods of auto-radiography using isotope of^<45>Ca and image analysis were applied to the soil salts movement under the conditons of sand columns in the laboratory. It was established by these methods that salts were analyzed quantitatively without soil sampling and salt movements were traced hourly in the soil colomns.
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