DESALINATION METHOD FOR IMPROVING TOPSOIL OF SALINE-ALKALI LAND BY USING SILT

A desalination method for improving topsoil of a saline-alkali land by using silt is disclosed. The method includes the following steps: (a) mixing topsoil of a saline-alkali land with silt, to form a mixed zone with a permeability coefficient of 1.Ox10-6 cm/s to 5.Ox1 0-5 cm/s; (b) building ridges around the mixed zone using silt, irrigating the mixed zone with fresh water for 2 to 4 months, and keeping a water depth of between 10 cm and 15 cm; and (c) planting rice in the mixed zone, and draining and irrigating the rice according to the growth characteristics and needs of the rice. Through mixing of topsoil of a saline-alkali land and silt, a mixed zone with a certain permeability coefficient is formed. In this way, a structure of the topsoil of the saline-alkali land can be improved, the soil fertility is improved, suitable conditions for the growth of rice are created, and a yield of the rice is improved. Moreover, after the structure of the topsoil of the saline-alkali land is improved by mixing with the silt, a permeability coefficient of the topsoil is decreased, and a permeation rate of a fresh water-containing soil layer is decreased, so that less fresh water can be used to maintain continuous downward permeation of fresh water, achieving salt-leaching and salt-reducing effects.