| 研究課題/領域番号 |
17K15328
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| 研究機関 | 東京大学 |
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研究代表者 |
ギータ モハン 東京大学, サステイナビリティ学連携研究機構, 特任助教 (90647075)
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| 研究期間 (年度) |
2017-04-01 – 2019-03-31
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| キーワード | Rice crop / fertilizer applications / rainfed / adaptation measures / rural Vietnam and India |
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| 研究実績の概要 |
The operation of research activities in FY 2017 has been successfully achieved as per the proposed plan. Our target crop, rice (Oryza sativa L.) is one of the important cereals for countries like Vietnam and India that occupies around 28.2 percent of rice production to the World total rice crop production in the year 2014-15. Though, the productivity under rainfed conditions are not exceeded more than one ton per hectare both in India and Vietnam. To reduce the yield gaps, we were conducted a rice experiments in Vietnam (Thoi Lai district, Can Tho, Vietnam) by using two promising rice varieties DS 20 and Jasmine 85; and for India (Medak district, Telangana), we used MTU 1010; Samba Mashuri rice varieties. The study aims to assess the response of rice varieties at different fertilizer levels in drought-affected areas and identify the suitable fertilizer level for each variety. In addition, we investigate the significant crop management strategies to improve the rice yields. The research findings exhibit that there was a strong correlation between grain yield and plant height, panicles number m-2 and number of filled spikelets per panicle. Among different fertilizer applications, 50N kg N ha-1 - 40 kg P2O5 ha-1 - 30 kg K2O ha-1obtained the highest grain yield as well as the most effective economic with producing of the varieties Jasmine in Vietnam and Samba Mashuri in India. Moreover, these varieties are tolerant to diseases resistant as well. Lastly, we recognized that late sowing as one of the significant adaptation measures for the prolonged drought and insufficient rain.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The fellow completed all the research activities proposed in 2017. Conducted rice experiments under different fertilizer treatments using selected rice varieties named (DS 20, Jasmine 85; MTU 1010 and Samba Mashuri) with the assistance of High Agriculture Technology Research Institute for Mekong Delta (HATRI), Can Tho in Vietnam, and National Institute of Agricultural Extension Management (MANAGE), Hyderabad, India. One of the worthy achievements, which is not initially planned earlier was to provide training on Decision Support System for Agrotechnology Transfer (DSSAT) crop modeling, particularly, by using the rice crop experimental data that is part of this project as a case study for the training. The training was taken around 30 scientists in the Mekong Delta region (for more details: http://hatri.org/en/activities/transfer-operations/training-general-setting-technology-and-decision-support-system-for-agrotechnology-transfer/n590.mt24h). On the other hand, we have submitted a research paper entitled, `The influence of fertilizer on grain yield of promising rice (Oryza Sativa L.) varieties in drought-affected Mekong Delta` with Thach Thi Ngoc Anh, Nguyen Thi Lang, Nguyen Trong Phuoc, Tran Bao Toan is under review to submitted in Field Crops Research journal.
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| 今後の研究の推進方策 |
In the starting of fiscal year 2018, we will organize an in-house meeting to discuss on designed structural household questionnaire with theme experts. After that, for estimating Cobb-Douglas Production specifications and the farmers’ management field observed rice crop data, we will conduct a household survey in Mekong River Delta and Northern region of Vietnam and Southeastern part of India with targeted household sample size of 150 questionnaires from each country and will administer the questionnaires with the assistance of five students. For assessing the country level situation of long term trends of cropping pattern on rainfed rice yields in lowland, drought and flood prone areas, and current and future climate change scenarios, we would be visiting and collect the information from the respective agricultural departments, statistical bureaus and meteorological agencies in Vietnam and India. By end of December 2018 or January 2019, we will finalize the data tabulation and analyze the preliminary research results of the household survey and secondary data. As I am anticipating that the significant management strategies and methods from the CERES-Rice experiment leads to reduce yield gaps and to achieve higher rice yields as well as household farm incomes in rainfed areas of Vietnam and India. Finally, the research outcomes will present at the international conferences and then we will submit our paper in a peer review journal. In the end of this project, I will synchronize all the project components and to submit our final project report to the funding agency.
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