Field study on impacts of soil water-salt distribution and winter wheat yield by different saline water combination irrigations

For the sake of analyzing the impacts on soil water-salt distribution and winter wheat yield with different combination irrigation orders, field experiments of saline water irrigation were carried out at Nanpi Ecological Experimental Station in Hebei Province from 2003～2005. Soil water-salt distribution was discussed and winter wheat yield was analyzed at the same time, the result indicated that the saline water with 3 g/L mineralization could be used as irrigation water of winter wheat, but the salt would be accumulated in the soil of taproot region and 100 cm depth; saline water irrigation should be neither continuously nor at the jointing stage, fresh-saline water alternately is the suitable method of combination irrigation; fresh-fresh-saline is the optimal mode in consideration of both the soil salt accumulation and the winter wheat yield, the study supplies a basis for reasonable exploitation and utilization of local ground saline water.