Soil acidity includes two aspects of acid strength and acidity, or active acidity and latent acidity. Acidity is the concentration of H in a soil solution that is in equilibrium with the soil solid phase, expressed as pH. The amount of acidity refers to the total amount of acid and buffering properties, and represents the total amount of exchangeable hydrogen and aluminum contained in the soil. Generally expressed as an exchangeable acid amount. Soil pH has great influence on soil fertility and plant growth. Many soils in northwest and north China have large pH values, while southern red soils have small pH values. It is therefore possible to grow crops and plants that are compatible with soil pH. For example, in the red soil area, tea trees with good acidity can be planted, and the alkali resistance of alfalfa is strong. Soil pH has a great influence on the availability of nutrients, such as the effectiveness of phosphorus in neutral soils; the trace elements (manganese, copper, zinc, etc.) in alkaline soils are ineffective. In the agricultural production, attention should be paid to the pH of the soil, and active measures should be taken to adjust it.
Therefore, a soil pH meter can be selected to detect soil pH and create a more suitable environment for plant growth.
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