Polyacrylamide (PAM) is a water-soluble linear polymer made by free radical polymerization of acrylamide (AM), which is widely used in industries such as papermaking, mineral processing, building materials, oil production, and sewage treatment. Polyacrylamide (PAM) can be used as a lubricant, suspension agent, water retention agent, oil displacement agent, thickener and water reducer. As a water-retaining agent, it is widely used in agriculture, forestry, land and other fields, and the effect is ideal. So what is the role of polyacrylamide (PAM) as a water retention agent? How effective is it? The following Henan Laixing Water Purification will answer you in detail.
Since PAM itself is non-toxic, it can be used as a soil conditioner in agricultural production, with functions such as water retention, soil retention, fertilizer retention, heat preservation, and yield increase. The application of polyacrylamide (PAM) as a water-retaining agent in agricultural and forestry land is of great significance to improve the utilization rate of irrigation or precipitation in arid and semi-arid areas in China.
Water retention: Adding anionic polyacrylamide (HPAM) to the soil can increase soil moisture content, inhibit soil crusting, increase water content, or maintain soil moisture content for a period of time after rainfall irrigation. As for the amount of anionic polyacrylamide (HPAM), a reasonable control plan is needed. It is not that the higher the application rate, the better the water retention effect. Many customers who have not used polyacrylamide (PAM) believe that the more water retention agents are used, the better the results. In practice, the recommended general application rate is 3-12kg/km2.
Fertilizer retention: Polyacrylamide (PAM) can not only increase soil moisture content, but also affect fertilizer adsorption. PAM can absorb fertilizer elements through its own structure, inhibit the loss of fertilizer elements, and improve fertilizer utilization. The contents of soil organic matter, available phosphorus, available potassium and available nitrogen treated with polyacrylamide (PAM) increased significantly. A large number of practices have proved that anionic polyacrylamide (HPAM) can improve fertilizer utilization by 25%~60%.
Thermal insulation: After polyacrylamide (PAM) is applied to the soil, the soil water content is absorbed by the mesh structure, the free water molecules are reduced, and the soil conductivity is reduced. The soil temperature is low during the day and high at night, and the daily temperature difference is reduced, which is particularly conducive to crop growth.
Yield increase: The application of polyacrylamide (PAM) improved the soil water and fertilizer retention capacity, enhanced the soil aggregate structure, improved the permeability and drought resistance of the soil, significantly improved the soil environment, provided a good environment for crop growth and development, significantly improved soil fertility, and increased the yield of soil fertility crops. The results showed that wheat yield could be increased by 10% when PAM was 18kg/km².