| Project/Area Number |
06454104
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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 |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMAJI Eiji The University of Tokyo, Division of Agricultural and Life Sceinces, associate professor, 大学院・農学生命科学研究科, 助教授 (10143405)
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| Co-Investigator(Kenkyū-buntansha) |
HOSHINO Tatsuo The University of Tokyo, Division of Agricultural and Life Sceinces, lecturer, 大学院・農学生命科学研究科, 講師 (40238738)
YOSHINO Kunihiko Tsukuba University, Division of Social Engineering, lecturer, 社会工業系, 講師 (60182804)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1995: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1994: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | Large-sized Paddy Field / Direct Sowing / Heterogeneity / Density of Seedling / 直播 / 生育の不均一性 |
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| Research Abstract |
The research activity in the fiscal year of 1995 is the continuation of field survey on heterogeneity of germination and growth, structure of soil and soil layr and experiment of germination and growth in lysimeters.
The field survey was done in the paddy field area in Sakura city, Chiba prefecture.Heterogeneity of seed density is smaller in the case of mist machine and larger in the case of hericopter.The average of density is easy for controling but standard deviation of density is difficult for controling.But the heterogeneity in standard deviation is critical for the possibility of spacity, which decreases the yield.
On the soil and aoil layr, characteristics of soil physics, soil chemistry(fertility)and levelling conditins are surveyed.As a result, it became clear that soil hardness is the important factor for growth of roots and plant.
Lysimeter experiment has made clear of the relationship between individual density and growth ; i.e.when the distance between seeds are 2 to 20 cm, the rates of growth does not changed.
As the result, in the case of direct seeding by random seedling, to avoid too much sparce places is the most important method.And for ensuring homogenerous germination and growth, the management of soil and soil layr is very important as wall as homogenerous seedling method.
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