ASSESSMENT OF GROUNDWATER CHARACTERISTICS AND ITS SUITABILITY FOR IRRIGATION USE IN RECLAIMED LAND OF HIKAWA TOWN

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  • 氷川町干拓地における地下水の水質特性と灌漑用水としての適性評価

Abstract

<p> In the reclaimed land in Wakasu district, Hikawa town, Kumamoto prefecture, some groundwater is used for irrigation, but poor growth of crops has been reported when groundwater is used for crop cultivation. Thus, we evaluated the characteristics of groundwater chemistry and its suitability for irrigation. In this study, shallow and deep wells were investigated, and the dissolved ion concentrations were higher in shallow wells. The Na-Cl type water in shallow wells and the (Na+Ca)-Cl type water in deep wells were mainly showed, indicating different water chemistry characteristics depending on the depth of the wells. The USSL and Wilcox diagrams were used to evaluate the suitability of groundwater for irrigation. Most of the collected groundwater could be used for irrigation, but it was considered unusable depending on the salt tolerance of the crops and the drainage environment of the soil.</p>

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