2021 Fiscal Year Final Research Report
Water saving irrigation targeting Ci
| Project/Area Number |
19K06003
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 39020:Crop production science-related
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 葉内CO2濃度 / スマート灌漑 / サトウキビ / 重量法蒸散 / ニトベギク / サップフロー / 微気象データ |
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| Outline of Final Research Achievements |
The amount and timing of irrigation are determined based on soil moisture and evapotranspiration, but in island areas where water resources are limited, efficient irrigation is required in consideration of the condition of plants. In this study, the timing of irrigation was determined based on leaf internal CO2 (Ci), meteorological data, and soil moisture, and an attempt was made to optimize water utilization efficiency. First, we developed a non-destructive and continuous measurement Ci cup, and examined whether Ci could be incorporated into the control system as a target for irrigation control. Next, we measured gas exchange and changes in Ci due to water stress, and accumulated data for the development of a Ci-based irrigation control system. The materials used were Mexican sunflower of C3 and sugar cane of C4, and the transpiration rate, sap flow, and diurnal change of Ci were measured at the same time.
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| Free Research Field |
作物学
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| Academic Significance and Societal Importance of the Research Achievements |
葉内CO2濃度（Ci）は作物が水分ストレスなどに敏感に反応するため植物の健康状態を診る「聴診器」の機能を有する．そこで，土壌水分，微気象データに加えCi も同時計測し，植物の健康状態に基づいて灌漑設備を制御すれば精緻な節水灌漑が実現出来ると考えた．通常 Ci は高価な光合成蒸散同時測定装置を用いて各ガス交換速度パラメーターから計算によって求められる．我々は既報において非破壊でしかも長期間 の連続測定が可能な新しいCi カップを開発した．本研究では，Ci 実測システムが灌水の制御のターゲットとして制御系に組み込めるか否かを検討したもので，画期的なアイディアといえる．
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