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近年来,应用磷石膏改良碱土或碱化土壤取得了明显效果,同时在改土实践中对磷石膏改碱方法进行了有益的探讨。从磷石膏改良碱土、碱化土化学性质的角度确定磷石膏用量,一般是以钙离子完全代换耕层土壤的代换性钠离子来确定。事实上,在盐碱区能保证作物正常生长的好土中,也含有一定代换性钠。用磷石膏改良碱土、碱化土无需将代换性钠完全
In recent years, the application of phosphogypsum to improve alkaline soil or alkalized soil has achieved remarkable results. At the same time, the method of modifying alkali from phosphogypsum has been discussed in practice. Phosphogypsum from the improvement of alkaline earth, chemical properties of alkalinity to determine the amount of phosphogypsum, calcium ions are generally substituted for topsoil replacement soil sodium to determine. In fact, in the saline-alkali region to ensure the normal growth of crops in good soil, but also contain some replacement sodium. Alkaline soil with phosphogypsum, alkalized soil without replacement of sodium completely