| Project/Area Number |
05660261
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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 |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Hiroisaki University |
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Principal Investigator |
HASEBE Jiro Hirosaki Univ.Agriculture Professor, 農学部, 教授 (90003574)
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| Co-Investigator(Kenkyū-buntansha) |
FUJISAKI Hiroyuki Iwate Univ.Agriculture Lecturer, 農学部, 講師 (30209035)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Conversion from Paddy Field / Orchard converted from Paddy Field / Subsoil Improvment / Soil Improvement / Physical Properties of Soil / Soil Structuer / Soil Pan Breaking / Penetration Resistance |
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| Research Abstract |
The physical properties of orchard soil when just converted from paddy field show poor characteristics. We investigated the change of properties after conversion and method of soil improvement. The results obtained are summarrized as follows ;
(1)The changes of permeability, soil three phases and pore size distribution with year are less in the surface soil than in the subsoil. However, this change is not necessarily indicate the improvement process of soil.
(2)The fields of orchard processed by soil dessing which is one of normal impovement method have a tendency to make hard compare with the fields processed by subsoil breaking. Soil dressing method is superior on supporting of tree trunk and traficability of field machines, except the probrem of too hard soil.
(3)Physical properties of orchard soil and falling damage of tree caused by strong wind showed high mutual relation. Especially, it related to soil density and the ratio of solid phase.
(4)Grinding shell powder was used as a soil amendment experimantary to a converted field and Wagner pot examination. The results obtained that some soil physical properties were improved slightly in surface soil layr. But the perpetual effect was not confirmed.
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