Analysis of clogging progress in drip irrigation for high-quality fruit cultivation using rice paddy water

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K23699
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0604:Agricultural economics and rural sociology, agricultural engineering, and related fields
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Mukai Akie 国立研究開発法人農業・食品産業技術総合研究機構, 農村工学研究部門, 上級研究員 (90414458)
• Project Period (FY): 2019-08-30 – 2022-03-31
• Keywords: 点滴灌漑 / 果樹栽培 / 水田用水利用 / 目詰まり / 藻類 / 土砂

Outline of Final Research Achievements

Soil mound rhizosphere restricted culture, which is a high-quality fruit cultivation method, is based on drip irrigation via rainwater elimination. Therefore, its daily irrigation rate is extremely high, and its use of rice paddy water is effective. In this study, we analyze the clogging progression of filters caused by algae and sediment in rice paddy water.
The period from July to August, i.e., when a significant amount of irrigation water is required, corresponds to a period of increased algae and sediment, the dynamics of which are expressed only in terms of Chl-a concentration and turbidity, and not in terms of the decrease in water pressure at the filter outlet, which is used to evaluate clogging currently. Therefore, clogging that results in irrigation stoppage is manifested as an abrupt decrease in water pressure, and the filter cannot be cleaned in advance. Therefore, measurements of Chl-a concentration and turbidity are recommended for the evaluation of clogging.

Free Research Field

灌漑排水学

Academic Significance and Societal Importance of the Research Achievements

目詰まり進行の正確なモニタリングにより，収量低下に直結する潅水停止を未然に防ぐことが可能となり，高品質な果樹栽培における水田用水の利用を促進できる．これにより，水源を地下水に頼らざるを得なかった果樹農家は，井戸掘削等にかかる非常に高額な費用を抑えることが可能となる．また，水田農業の高収益化施策に基づき，水田での果樹栽培を推進する国及び地方公共団体等に対して，有益な情報を与えることができる．