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At a certain depth in saline-alkali land, a saline-alkali isolation layer is set up to prevent the upward migration of salt and alkali components from below, which would otherwise hinder plant growth. Meanwhile, fungi are added to the upper saline-alkali soil to improve its quality, and the upper saline-alkali soil is washed by rainwater to lower the pH and salinity levels, thus making it suitable for plant growth.
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