Flue gas desulfurization (FGD) gypsum and straw return have been recognized for their roles in reducing soil sodicity and improving soil organic matter. However, there are few studies on the effect of their combination on improving and fertilizing sodic soil. FGD gypsum at a rate of 15 t ha⁻¹ and three types of straw (sunflower seed shell, corn stover, and corncob crushed into straw pellets) at a rate of 7.5 t ha⁻¹ were applied to sodic soil from 2017 to 2019, and their effects on soil salinity and sodicity, nutrient content, and water-stable aggregate fractions were observed. FGD gypsum application significantly decreased soil pH, sodium adsorption ratio, and exchangeable sodium percentage, with significant changes in NH₄⁺-N content. After FGD gypsum treatment, the 250–2000 μm aggregate fraction increased, and the <53 μm fraction decreased, resulting in an increase in the mean weight diameter of the soil aggregates. Except for corncob straw, straw application had no significant effect on soil salinity or sodicity. Straw application increased the soil organic carbon content in 2017 and increased the inorganic nitrogen content in 2017 and 2018. Moreover, FGD gypsum and straw applications interactively affected the soil NH₄⁺-N and NO₃⁻-N contents. Water-stable aggregates, excluding the <53 μm fraction, were not affected by straw application. The combined application of FGD gypsum and corn stover or sunflower seed shell is a feasible option for sodic soil amelioration and can control salinity and sodicity and improve soil fertility.

烟气脱硫（FGD）石膏和秸秆还田在减少土壤中的碱度和改善土壤有机质方面发挥了作用。然而，关于它们的组合对改良和施肥苏打土壤的影响的研究很少。从2017年到2019年，将15 t ha ^-1的烟气脱硫石膏和7.5 t ha ^-1的三种类型的秸秆（葵花籽壳，玉米秸秆和玉米芯粉碎成秸秆的颗粒）以7.5 t ha ^-1的比例施用于钠盐土壤，并观察了它们对土壤盐分和碱度，养分含量以及水稳性骨料组分的影响。FGD石膏的施用显着降低了土壤的pH值，钠的吸附率和可交换的钠百分比，并且NH ₄ ⁺发生了显着变化-N内容。FGD石膏处理后，集料的250-2000μm比例增加，而<53μm的比例降低，导致土壤团聚体的平均重量直径增加。除玉米芯秸秆外，秸秆还田对土壤盐分或碱度无明显影响。稻草申请在2017年增加了土壤有机碳含量和在2017年和2018年增加了无机氮含量此外，FGD石膏和秸秆应用交互影响土壤NH ₄ ⁺ -N和NO ₃ ^--N内容。除<53μm的部分以外，耐水团聚体不受秸秆施用的影响。将烟气脱硫石膏与玉米秸秆或葵花籽壳组合使用是改善钠盐土壤的可行选择，并且可以控制盐度和碱度并改善土壤肥力。