| Project/Area Number |
14405033
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
生物資源科学
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| Research Institution | Chiba University |
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Principal Investigator |
KIKUCHI Masao Chiba University, Faculty of Horticulture, Professor, 園芸学部, 教授 (10241944)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAGAKI Michiko Chiba University, Faculty of Horticulture, Lecturer, 園芸学部, 講師 (00206715)
MARUO Toru Chiba University, Faculty of Horticulture, Associate Professor, 園芸学部, 助教授 (20143266)
NISHIYAMA Mima Chiba University, Faculty of Horticulture, Assistant Professor, 園芸学部, 助手 (70323392)
SHINOHARA Yutaka Chiba University, Faculty of Horticulture, Professor, 園芸学部, 教授 (30015903)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2004: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2003: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 2002: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Tropical Asia / Environmental load / NP flow / cultivation system / excess fertilization / water pollution / underground water pollution |
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| Research Abstract |
This study aims to collect basic data for building sustainable agriculture in urban peripheries of large metropolitan areas in Tropical Asia through clarifying quantitatively the actual status of environment load due to agricultural activities from the agronomic as well as social scientific points of view, and through identifying the dynamics of nitrogen/phosphorus fertilizers.
In August 2002, we conducted preliminary surveys to select sample fields for this study in the basin of the Nakonchaisy covering the Districts of Nontabri, Nakonchaisy, and Suphanburi, and selected the county of Banglaen and Songpinon as the candidate areas. Also decided were four cultivation patterns to be studied ; (1)rice cultivation in paddy, (2)vegetable cultivation in polder, (3)water convolvulus cultivation in paddy and (4)water convolvulus cultivation in river.
In 2003 and 2004, for the sample fields, farmers kept farming records, and sampling was commenced for monthly soil and water samples and for half-y
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early soil samples from different depth. These surveys indicated that the economic returns were high for almost all crops and cultivation patterns. It was also found that farmers adjust the quantity of fertilizers and compost according to which crop was previously grown and whether or not crops were inundated. For all crops and all crop seasons, the cost of insecticides was more than the cost of fungicides. Hired labor was employed for such farming activities as land preparation, seeding, thinning, harvesting and packing. Soil data in August and March revealed that inorganic contents were high for nearly all fields and bottom sludge of the river. In particular, August samples had higher values than March samples. The intensive management of vegetable cultivation between April and August was understood as the reason why such results were obtained. Our study also made it clear that the inundation practice in vegetable cultivation, which farmers in the study area adopted to maintain the soil condition of their fields in good conditions, resulted in the high contents of ion in the water of rivers and canals.
This study succeeded to identify farming activities that result in high environment load. Some measures to counteract against such situations were proposed, but much room was left for further research. Less
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