Effects of Improved Saline-Alkali Soil with Synergistic Addition of Coal Slime and Silica Calcium Slag on Wheat Growth

Abstract

The feasibility was explored for synergistic addition of coal slime and silica calcium slag for saline-alkali soil improvement. A pot method was used to evaluate the effects on physicochemical properties of saline-alkali soil and wheat growth. The results demonstrated that the density and bulk density of saline-alkali soil were reduced with the synergistic additions, but the water content and the contents of organic matter, nitrogen, phosphorus, and potassium in the soil were increased. The emergence and growth height of wheat seedlings was found to be effectively improved. In terms of the emergence, no matter what proportion of M-G (coal slime: silica calcium slag ratio) was used, the emergence of wheat was greater than 70% when the addition amount was at 20%. In terms of seedling length, when the aggregate addition reached 35%, the high coal slime content (M-G 3:1) did not play a greater role in fostering the development of wheat. Therefore, with M-G 1:1, 35% addition of the soil can meet the growth needs of wheat in the early stage. In summary, the synergistic addition of coal slime and silica calcium slag has a promising application in the field of saline-alkali soil improvement.