Abstract: A field experiment was conducted to study the distribution characteristics of water and salt in a spring wheat soil under brackish water irrigation. Three irrigation quota (100%ET_c, 80%ET_c, and 60%ET_c) and three water salinity levels (0.7, 3 and 6 g·L^-1) were installed. The results showed that soil water distribution was affected by irrigation quota and soil texture. Sufficient irrigation made the irrigation water stored in deeper soil layers; while insufficient irrigation made the irrigation water more stored in top soil layer. Under the same irrigation quota, the salt accumulation in soil body increased with increasing water salinity; while under the same water salinity, the salt content and salt accumulation depth in soil body increased with increasing irrigation quota. Successive brackish water irrigation in the whole growth period of spring wheat induced soil salinization, and insufficient irrigation made the salt more accumulated in surface soil layer, compared with sufficient irrigation.

Key words: soil water distribution, soil salt accumulation, brackish water irrigation, spring wheat, Tetranychus cinnabarinus, Zea mays,  DIMBOA, total phenolic, trypsin inhibitor, chymotrypsin inhibitor.