Water Quality Guidelines For Agriculture

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Water quality for different usages depends on type and concentration of dissolved materials in it. So, while a sample is deemed appropriate for drinking usage it may not be employed for other usages in industry or agriculture. Food and Agriculture Organization of the United Nations (FAO) has published the water quality guidelines for agriculture. The agriculture sector consumes about 94 percent of total annual water in Iran as the biggest stakeholder (Alizadeh and Keshavarz, 2005). Given the effects of irrigation water on soil and crops, monitoring and assessment of groundwater quality are very important. Therefore, groundwater quality assessment is one of the most important environmental issues across the world for decision makers.…show more content…
Passing through different layers of soil and geologic formations, water quality changes from recharge to discharge. Again, perception of hydrochemical evolution is still a challenge for hydrogeologists (Singh et al., 2013). Furthermore, the suitability of irrigation water is influenced by different factors such as soil type, soil drainage, salt tolerance and crop types (Michael, 2008). Therefore, groundwater quality, soil information and socioeconomic condition of the stockholders should be also considered in groundwater quality assessment to achieve the integrated water resources development (Kawy, 2012). The main focus of the present study is on groundwater quality rather than other factors. The frequently used criteria for water quality evaluation are the SAR, SSP, RSC, PI, MAR, KR and EC. SAR is another important parameter for determining the suitability of groundwater for irrigation purposes which indicates alkalinity hazard to crop (Raghunath, 1987). Excessive sodium content in irrigation water may produce deteriorating influences in growth of plants and soil structure such as dispersion of clay particles, soil hardness, surface crusting, hydraulic conductivity in most soils (Todd and Mays, 2005; Suarez et al., 2006; Ramesh and Elango, 2012) Since
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