Abstract: The experiment was conducted to investigate the effect of irrigation water sources(well water and sea ice water) and fertilization(four methods) on soil water content,cotton yield,and water use efficiency(WUE) in the coastal saline soil.The four fertilization methods included inorganic fertilizer,inorganic + organic fertilizers,inorganic fertilizer + soil conditioner,and CK(no fertilizer).The results showed that:(1) during growing periods the soil water content in the 1 m soil layer with sea ice water irrigation were higher,especially after irrigation in the 0-40 cm layer,about 12%,than those with well water irrigation.(2) The yield of cotton in plots with inorganic + organic fertilizers and inorganic fertilizer + soil conditioner increased by 12% and 22%(using well water irrigation) and 10% and 27%(using sea ice water irrigation),respectively,as compared with the yields in plots with inorganic fertilizer.(3) By using sea ice water irrigation,the WUE of cotton in plots with inorganic + organic fertilizers,and inorganic fertilizers + soil conditioner increased by 8% and 30%,respectively,as compared with the inorganic fertilizer treatment.There were no differences in the yield of cotton and WUE between sea ice water and well water treatment.

Key words: Sea ice water, Sea ice water, Saline, Cotton, Water utilization efficiency