Modeling for establishing wheat producing system to quickly adapt to the commodity treaty changes

• Project/Area Number: 25450020
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Crop production science
• Research Institution: The University of Tokyo
• Principal Investigator: OKADA Kensuke 東京大学, 大学院農学生命科学研究科(農学部), 教授 (80391431)
• Research Collaborator: TAKAHASHI Taro 東京大学, 大学院農学生命科学研究科, 特任研究員 (20540876)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 作物モデル / APSIM / 意思決定支援システム / 小麦 / 子実タンパク質含量 / コムギ / タンパク含量 / 貿易自由化 / 生産者意思決定システム / 価格分析

Outline of Final Research Achievements

The self-sufficiency of wheat in Japan is ca. 10%, and it is imperative to prepare the optimized production system which can quickly adapt to any changes of the free-trade treaties with the countries from which wheat is imported. Therefore, to develop the optimized wheat production system, we aimed at applying crop growth model for wheat production system which has not been tried in Japan so far.
A series of field experiments with different nitrogen application patterns and sowing dates were tried for five seasons at Nishitokyo City in Tokyo. And the parameter improvement (calibration) and validation of the APSIM crop model were conducted and the practical level of precision was confirmed. Then scenario analysis of a number of nitrogen application schemes were conducted in Kanto area and Hokkaido. As a result, the possibility of attaining higher yield and profitability under the higher nitrogen application levels than the current recommendation was demonstrated.

Research Products

• [Journal Article] Controlling yield and grain protein content of wheat in Japan through pre-anthesis nitrogen application to maximize producers' profit (2018)
  • Author(s): De Silva S.H.N.P., Taro TAKAHASHI, and Kensuke OKADA
  • Journal Title: JARQ Volume: 52 Pages: 205-217
  • NAID: 130007436992
  • Peer Reviewed / Open Access
• [Presentation] Preliminary evaluation of optimum N management for soft and hard wheat in Kanto area through crop growth simulation (2017)
  • Author(s): De Silva S H N P, Taro Takahashi, and Kensuke Okada
  • Organizer: 日本作物学会第243回講演会
• [Presentation] Effect of flowering time nitrogen application on grain yield and grain protein content: a comparative study between hard wheat and soft wheat in Kanto area (2015)
  • Author(s): De Silva S H N P, Taro Takahashi, Kensuke Okada
  • Organizer: 日本作物学会第240回講演会
  • Place of Presentation: 信州大学長野キャンパス（長野県長野市）
  • Year and Date: 2015-09-05
• [Presentation] Validation of the APSIM crop growth model for Japanese wheat varieties across N application rates (2015)
  • Author(s): de Silva SHNP, Okada K, Takahashi T
  • Organizer: 日本作物学会第239回講演会
  • Place of Presentation: 日本大学 (神奈川県藤沢市)
  • Year and Date: 2015-03-28
• [Presentation] Parameterization of the APSIM crop growth model for Japanese wheat varieties across sowing times and N application rates (2014)
  • Author(s): de Silva SHNP, Takahashi T, Okada K
  • Organizer: 日本作物学会第238回講演会
  • Place of Presentation: 愛媛大学 (愛媛県松山市)
  • Year and Date: 2014-09-09
• [Presentation] Decision support system for nitrogen fertilization in wheat using crop growth model (APSIM) : Model parameterization and validation. (2014)
  • Author(s): De Silva S H N P, Takahasni T., Okada K.
  • Organizer: 農業情報学会2014年次大会
  • Place of Presentation: 東京大学農学部弥生講堂