Establishment of water-saving salt removal system by extension of the surface suction leaching method

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K06291
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 41030:Rural environmental engineering and planning-related
• Research Institution: Tottori University
• Principal Investigator: INOSAKO Koji 鳥取大学, 農学部, 教授 (60243383)
• Co-Investigator(Kenkyū-buntansha): 野波 和好 鳥取大学, 農学部, 教授 (20704795) ; 齊藤 忠臣 鳥取大学, 農学部, 准教授 (70515824)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 除塩 / 塩類集積 / 乾燥地 / 農地修復

Outline of Final Research Achievements

In this study, we attempted to develop a salt removal machine equipped with a larger-scale version of the surface suction leaching device for actual field applications. First, the salt removal process using this method was reproduced by a numerical model, and the existence of optimal operating conditions was clarified by numerical experiments. Next, a salt removal machine equipped with a large-sized surface suction leaching device was fabricated by modifying a cultivator. The machine is equipped with an operation panel that can be automatically controlled so that the operator can complete the salt removal work by himself. Finally, salt removal experiments were conducted using the machine on two types of salt-accumulating soil layers with different permeability. The results showed that a maximum salt removal rate of 65% was achieved in the low permeability soil, but the variation was large and further improvement is needed for practical use.

Free Research Field

農業農村工学分野

Academic Significance and Societal Importance of the Research Achievements

塩類集積が深刻化した農地を再生する除塩方法は現在存在しない．そのため，塩類集積が容易に深刻化する乾燥地域では，発生の初期段階において対処する必要がある．本研究では，発生初期の部分的な塩害農地を修復する能動的な方法として表層吸引溶脱装置を実装した自走式除塩作業機を開発した．本機による除塩法は塩類集積農地を抜本的に改善するものではないが，発生する度に逐次処理するという新しい対処法を提示したといえる．