2004 Fiscal Year Final Research Report Summary
Evaluation of agricultural resources and sustainability in tropical upland crop area developed in large scale
| Project/Area Number |
13306026
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物資源科学
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| Research Institution | Kyoto University |
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Principal Investigator |
NAWATA Eiji Kyoto University, Graduate School of Agriculture, Assoc.Professor, 農学研究科, 助教授 (30144348)
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| Co-Investigator(Kenkyū-buntansha) |
SAKURATANI Tetsuo Kyoto University, Grad.Sch.Agriculture, Professor, 農学研究科, 教授 (00260612)
MATOH Toru Kyoto University, Grad.Sch.Agriculture, Assoc.Professor, 農学研究科, 助教授 (50157393)
KONO Yasuyuki Kyoto University, Center for Southeast Asian Studies, Assoc.Professor, 東南アジア研究所, 助教授 (80183804)
FUNAKAWA Shinya Kyoto University, Grad.Sch.Agriculture, Assoc.Professor, 農学研究科, 助教授 (20244577)
HIGUCHI Hirokazu Kyoto University, Grad.Sch.Agriculture, Assist.Professor, 農学研究科, 助手 (50303871)
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| Project Period (FY) |
2001 – 2004
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| Keywords | Agricultural resources / Climate / Cultivation environment / Field crop production / Land use / Mainland Southeast Asia / Slope land agriculture / Sustainability |
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| Research Abstract |
Agricultural resources and sustainability of agricultural producing systems in Northeast and Central Thailand, and Northwest Vietnam, which were developed for agriculture in the middle of 20th century or later, were evaluated. Major outcomes were as follows.
1)Long-term meteorological data in Northeast Thailand were mapped, showing that in this area air temperature and solar radiation are relatively stable, whereas the rainfall is unstable with large regional and yearly variations, and uneven distribution. In addition, there was no correlation between annual rainfall and the number of rainy days and the number of rainy days showed large regional variations. Largest limiting factor for sugarcane production was suggested to be soil moisture contents, which in turn were related to be soil clay contents. The slope angle did not affect productivity pronouncedly. It is indicated that sandy soils prevailing in Northeast Thailand contains low organic materials and the efficiency of fertilizer a
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pplication was very low.
2)In vegetable production areas in Central Thailand, unique cultivation system using raised-bed-dikes called "rong chin" with large amount of fertilizer application was broadly observed and it is suggested that in these systems large amount of applied fertilizers, especially phosphorus, was not absorbed by plants and accumulated in surrounding environments. In field crop areas, it is clarified that diversified farming and cropping systems have been established according to environmental conditions and diversification index of cropping system became largest in areas with moderately favorable conditions. In these areas, it is also suggested that the possibility for rapid soil degradation is low due to gently undulating topography and generally high soil clay contents.
3)In field crop areas in Northwest Vietnam, it is clarified that mountain slopes, utilized traditionally for shifting cultivation until recently, were changed to be permanent crop fields, producing cash crops such as maize and edible cannas with diversified cropping systems adapted to their environmental conditions, and that soil degradation is worried because of the utilization of steep mountain slopes despite the predominance of erosion-resistant clayish fertile soils. Less
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[Journal Article] Changes in seasonal evapotranspiration, soil water content, and crop coefficients in sugarcane, cassava, and maize fields in Northeast Thailand.2004
Author(s)
Watanabe, K., T.Yamamoto, T.Yamada, T.Sakuratani, E.Nawata, C.Noichana, A.Svibutta, H.Higuchi
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Journal Title
Agricultural Water Management 67
Pages: 133-143
Description
「研究成果報告書概要(和文)」より
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