Effect of pH on Soil Fertility
In addition to the common N, P and K trace elements in soil nutrients, soil pH, pH, salt and other factors are also important factors affecting soil nutrient fertility. The soil nutrient fastness meter can quickly determine the PH value of the soil. So what is the relationship between soil pH and soil nutrient? What is the impact of too large or too small pH on soil fertilizer? As can be seen from the figure, the soil pH values ​​for the treatment measures and controls are 4.3 to 4.8, both less than 5.6, and they are acidic soils. The average soil pH in each layer treated was 4.5, which was 0.2 lower than the average value of the control. The average value of the pH value of the treated soil was 4.8. The average value of the pH values ​​of the treated soil was 4.3, indicating that the ditch and grass were removed. In addition to irrigation measures, other measures have led to a drop in soil pH. Ecological soil orchard development and management, mixed with trees and shrubs and grasses, the pH value of the surface soil is only 4.1. The formation of soil acidity and alkalinity is determined by the relative strength of the salt leaching and salt base accumulation process. It is constrained by the conditions of parent material, bioclimatic and agricultural measures, etc. It is one of the important influence factors of soil fertility. The change of soil pH directly affects the existence and availability of nutrients in the soil, and can also affect soil ion exchange, movement, migration and transformation, and soil microbial activity. From the vertical distribution of soil profile pH, the pH value of the soil surface is the lowest, and the pH value of the soil profile gradually increases from the surface layer to the lower layer. This may be due to the fact that the 0-20cm layer of the soil profile is the first to receive acid precipitation and H+ resulting from the decomposition of soil organic matter. Therefore, the pH value of the soil is the lowest, but the surface soil is also the biggest beneficiary of nutrient elements (degraded by litter decomposition). ), so in the case of low pH, while having relatively high nutrient content, the soil still has some acid buffering capacity.
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