摘要：Seasonal fresh water scarcity limits the sustainable development of agriculture in many areas around the world and forces these areas to use alternate brackish and fresh water irrigation. Our study conducted a lysimeter experiment using winter wheat as plant material in eastern China. Three salinities of irrigation water (1 g L-1, 3 g L-1 and 5 g L-1) combined with three different brackish-fresh alternate irrigation modes were designed which abbreviated as brackish-fresh -fresh, fresh-brack- ish-fresh”，“fresh-fresh-brackish”（“brackish-fresh- fresh” refers to irrigation using brackish water only during the wheat's overwintering to seedling establishment period; "fresh-brackish-fresh refers to irrigation using brackish water only during seedling establishment to elongation; Afresh-fresh-brackish” refers to irrigation using brackish water only during the elongation to heading). The soil electric conductivity (EC), water use efficiency (WUE), yield, and concentrations of amino acid, vitamin B2, fat and crude protein in grain were determined. Meanwhile, the entropy weight coefficient evaluation model was employed to evaluate different alternate irrigation modes. The results indicated that the calculation values of the index weight of EC and yield were higher than that of other indexes. According to the entropy weight coefficient evaluation model, T7 was the optimal brackish-fresh water alternate irrigation mode, and the entropy weight coefficient evaluation value was 0.92. Under T7 irrigation mode, surface soil EC, WUE, comprehensive quality evaluation value and yield were 106.5 cm"1, 23.9 kg ha-1 mm-1, 0.98 and8817 kg h a 1, respectively. Therefore, in practice, it is recommended to use 1 g L1 brackish water combined with "fresh-fresh-brackish” alternate irrigation mode for winter wheat production. Entropy weight coefficient evaluation model is proved to be scientific and reliable in our study, and has a wide prospect in evaluation of agricultural water management schemes.
