Projects with water conservation, proper irrigation and drainage, shifting rice planting have been developed for preventing extension of saline-alkaline soil (Abbasi et al., 2011) while chemical amendments of plaster, gypsum as well as organic materials have been practiced with depressing salinity in croplands in many countries (Amezketa, 2006). China's agriculture is facing a great challenge of sustaining crop production with the increasing drought and soil salinization risk in the agricultural region of North China due to the climate change