| Project/Area Number |
63044024
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Chiba University |
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Principal Investigator |
YOSHIDA Tomio Chiba Univ., Prof., 園芸学部, 教授 (30109912)
吉田 富男 (1990) 千葉大学, 園芸学部, 教授
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| Co-Investigator(Kenkyū-buntansha) |
プラマジャニ ハ゜イブーン タイ国土壌開発局, 主任
ペチャウイ サムナオ タイ国農業局, 土壌部, 主任
ブロムシリ アンハ゜ン チェンマイ大学, 農学部, 助教授
チャンチャレオンスーク ジヨングラツ カセサート大学, 農学部, 助教授
ハ゜シャクハ゜タナ スハ゜マー カセサート大学, 農学部, 助教授
バチャロタヤン ソラシッ カセサート大学, 農学部, 教授
SATO Yukio Chiba Univ., Lecturer, 園芸学部, 講師 (00009549)
USHIKUBO Akikuni Tokyo Univ. of Agr., Assoc. Prof., 農学部, 助教授
FUKAMI Motohiro Utsunomiya Univ., Assoc. Prof., 農学部, 助教授
NAKANO Masashi The Univ. of Tokyo, Prof., 農学部, 教授
YAMAZAKI Kou The Univ. of Tokyo, Prof., 農学部, 教授
PHETCHAWEE Samnao Department of Agriculture, Senior Scientist
BHROMSIRI Ampan Chiangmai Univ., Asst. Prof.
CHANCHAREONSOOK Jongruk Kasetsart Univ., Assoc. Prof.
PANICHSAKPATANA Supamard Kasetsart Univ., Assoc. Prof.
VACHAROTAYAN Sorasith Kasetsart Univ., Prof.
PRAMOJANEE Paiboon Land Development Department, Senior Scientist
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥18,000,000 (Direct Cost: ¥18,000,000)
Fiscal Year 1990: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1989: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1988: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Keywords | Tropical monsoon / Soil degradation / Cultivated soil / Uncultivated soil / Soil physical properties / Soil chemical properties / Soil microbiological properties / Root morphological properties |
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| Research Abstract |
We have studied the soils in the tropical monsoon regions, mainly the soils distributed in Thailand emphasizing soils classified as "Ultisols" which has been considered to be one of the most degradable soil types in the tropical regions. The ecological fragility in the tropics were considered mainly due to the degrability of the soils in these regions. For elucidating the basic concept involved in the degradation mechanism, firstly, we had to spend our effort to a greater extent in selecting sites for the soil sampling where the type of soil should be identical from the viewpoint of the soil genesis but different in human management as "Cultivated vs Uncultivated". Secondly, we have tried to investigate from the viewpoint of soil properties and crop root morphology which might be involved with the degradation mechanisms of soil.
As a result we succeeded in collecting 30 soil samples in 1988, 41 in 1989 and in 1990 mostly from areas of the Ultisols soil type. Furthermore, these soil samples were analyzed for the physical, chemical, microbiological and root morphological properties in order to investigate th possible mechanisms involved in the soil degradation.
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