Section 2 Index of soil acidity 一、 Intensity index of soil acidity (一) pHvalue pH- the negative log of the hydrogen ion(H) concentration in the soil water solution pH=-log[ht (二) Lime potential Lime potential will be introduced later course (Agricultural Chemistry) Soil acidity is brief name of soil acid and baseSection 2 Index of soil acidity Soil acidity is brief name of soil acid and base! 一、 Intensity index of soil acidity （一）pH value pH - the negative log of the hydrogen ion(H+ ) concentration in the soil water solution. pH = - log [ H+ ] （二）Lime potential Lime potential will be introduced later course (Agricultural Chemistry)