The difference in soil properties determines the classification of public opinion

The soil moisture content reflects the balance of income and expenditure of soil moisture in a region. Generally, it can be measured by a soil moisture meter or by using a soil moisture monitoring system. In areas with low water and drought, the source of soil moisture is atmospheric precipitation, groundwater and artificial irrigation: the main expenditures are ground evaporation, crop transpiration and deep leakage.

Different types of soil moisture reflect a certain degree of moisture and have a certain range of water content. Due to the differences in physical, chemical, and soil moisture characteristics of the soil, the absolute moisture content of the soil is different, although they are of the same moisture level.

In the Huangpan Plain area, the soil is cultivated soil cultivated and matured on modern alluvial parent materials. Soil properties are mainly affected by the mechanical composition of the soil, and the name of the soil is also named according to the name of the soil. Farmers distinguish the soil into sand (sand, loam) and soil (sand soil) according to the differences in the characteristics of different textures. , light soil, and loam) and silt (heavy soil, clay). The content of grit (l-0.05mm) in sand is more than 65%, the content of coarse silt of sand (9.05-0.01mm in loess) is more than 50%, and fine silt and clay content of silt soil It accounts for more than 70%. Particles of different particle sizes have different specific surfaces and the ability to absorb water and water is also different. Therefore, the absolute value of the water constant is different, and the actual water content of the same type of soil moisture in different soils is also significantly different.

During the rainy season, the rain and water increase during the flood season (mainly July and August): During this period, high temperatures and rain, the rain can wet the entire soil layer, and showered to the deep layer. At the same time, the groundwater level rises significantly. The leader supporting the capillary water reaches the upper part of the soil profile and can even reach the ground surface, making the soil moisture in a state of black muddy or saturated with water. It is necessary to pay attention to water conservation and flood protection, and when rain is excessive, in order to guarantee autumn crops The normal growth, but also drained.

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