The soil amendments play an important role in improving the soil salinization. In this paper, the coal fly ash, the FGD gypsum, the dual modifier (desulfurization gypsum + cow dung) are selected as the soil amendments, meanwhile, the compositions and application rates of the amendments and the irrigation amount are taken as the main influencing factors in the oil-sunflower-planting tests in the field to study their effects on the saltinizition soil pH values, the TDS, and the oil-sunflower seedling emergence rate in the early period of improvement. It is shown that the highest reduction amount of the soil pH value is achieved by the T₇ treatment (application of the desulfurization gypsum of 29.86 t/hm², high irrigation), reaching 2.36. The highest reduction amount of the soil TDS is achieved by the TN₆ treatment (application of the dual modifier of 22.40 t/hm², low irrigation), reaching 81.32%, but they are only 1.45 and 76.06% in the control treatment (no applications of amendments). The highest oil-sunflower seedling emergence rate is achieved by the TN₁ treatment (application of the dual modifier of 14.92 t/hm², high irrigation), reaching 70.83%, 37.16% more than the control treatment. Application of the soil amendments can effectively reduce the soil pH value and the TDS, improve the soil conditions significantly, and promote the crop growth Furthermore, the effect of amendments can be enhanced with the proper regulation of irrigation.

soil salinization  /  amendment  /  improvement  /  soil physical-chemical properties  /  oil-sunflower seedling rate