Secondary Salinization Control Based on Hydro-Salinity Balance in Oasis Irrigation Area

Soil secondary salinization poses a substantial threat to irrigated agriculture in oasis irrigation districts,Xinjiang.Taking Weigan river irrigation district located in the Tarim basin as an example,with a brief analysis of the controlling factors in irrigated areas,the characteristics of hydro-salinity balance and their effects at three scales(namely,irrigation area scale,farmland scale and soil profile scale) are analyzed deeply based on the hydro-salinity principles.The leaching water requirement is calculated and discussed extensively.The driving factors of soil secondary salinization are surveyed and the corresponding strategies countermeasures to control soil salinization and promote sustainable agriculture are proposed.We conclude that the improvement of water utilization rate and maintaining necessary leaching water requirement are the key methods to control soil secondary salinization.