The key to use FGD gypsum in saline alkali improvement is to determine the application amount, application time and application depth.<br>This was recommended by Xiao et al. For the use of FGD gypsum in three different types of saline alkali soils, based on field and field trials conducted in Xidatang, (Table 4). Xiao et al. Also showed that the degree of soil alkalization and total alkalization could be significantly reduced by 56-60% by using FGD gypsum.<br>
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