2022 Fiscal Year Final Research Report
Proposal of precision irrigation information by water dynamics analysis with spatial heterogeneity of leaf and soil
| Project/Area Number |
20H03099
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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 | 一般 |
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| Review Section |
Basic Section 41030:Rural environmental engineering and planning-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
中桐 貴生 大阪公立大学, 大学院農学研究科, 准教授 (80301430)
辻本 久美子 岡山大学, 環境生命科学学域, 助教 (80557702)
濱 武英 京都大学, 農学研究科, 准教授 (30512008)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 畑地灌漑 / 土壌水分動態解析 / リモートセンシング / 精密農業 / ミカン |
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| Outline of Final Research Achievements |
Leaf water potential, which is an indicator of irrigation for mandarin oranges, can be estimated from red-edge wavelength, RGB information, and leaf displacement information. The difference between leaf surface temperature and air temperature was found to be negatively correlated with the amount of soil water depletion under given solar radiation conditions. These results suggest that it is possible to estimate the leaf and soil water conditions from these remote information, and to estimate the timing and required amount of irrigation water. Furthermore, when the observed data were applied to Simple Biosphere Model (SiB4) that calculates vegetation and soil moisture dynamics, the reproducibility of soil moisture content remained a problem, but the reproducibility of the difference between leaf surface temperature and air temperature was high. In addition, a direct multi-point soil moisture measurement system was constructed.
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| Free Research Field |
灌漑排水学
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| Academic Significance and Societal Importance of the Research Achievements |
ウンシュウミカンの高品質化のために，樹による必要な灌水の違いを考慮することを目的とした場合，それぞれの樹の必要灌水量を推定できる遠隔情報が葉面温度であること，灌水のタイミングの指標となる葉の水ポテンシャルを推定できる情報がレッドエッジ波長，ＲＧＢ情報，葉の変位情報であることを示したことは，ミカンの品質向上のための精密水管理手法を実用化していく上で意義あることと考えられる．
また，廉価な土壌水分センサーを用いた土壌水分量の直接的な多点観測システムの基本を構築したことは，水管理によって品質向上を目指す園地管理者に有用な選択肢を与えることができたと考えられる．
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