DECREASING ELECTRICAL-CONDUCTIVITY OF IRRIGATION WATER BY DILUTION

Although 750 mu mho/cm is the limit for the electrical conductivity (E C) in the ''Standard of Taiwan Irrigation Water Quality,'' the EC of i rrigation water is usually over limit, resulted from the pollution dum ped into the rivers, streams, and creeks. It will be a damage to agric ultural crop using polluted irrigation water. The basic principle of d ilution can neutralize high EC of polluted water using pure or low EC water. With the increasing quantity of clean water, the polluted water will drop its EC to a certain extent. Therefore, the purpose of this study is to determine the relationship between dilute water quantity a nd its. EC. As results shown in this study, pure water or water of low EC mixing with water of high EC can be a basic principle for diluting . The practical principle can be used in the farms and the results mee t the irrigation water standard. Moreover, the better quality of dilut e water is, the less its quantity is; the worse the quality the more t he quantity is. Furthermore, the electrolyte effect and the principle of Le Chatelier in aquatic chemistry are resulted in solubility of sal t and EC of mixed water solution increase. All the precipitation, coag ulation, and flocculation will decrease free ions' content and EC in m ixed water solution.