Such as irrigation, build dam water use for agriculture. The properties of water in nature consists of inorganic salt additives, in particular, sodium chloride, while water use for agriculture. The water will evaporate vapor natural inorganic salt content which has evaporated residue in the soil. When they accumulate more, the salt content in the soil increased. Make saline soil is not suitable for cultivation. Quantity of inorganic salt residues may be washed away after rain or by water from irrigation. Inorganic salt is transmitted into the river finally.
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