The important role of soil amendment polyacrylamide in soil

Polyacrylamide(PAM), as a widely used polymer, plays an important role in multiple industries such as soil improvement and sewage treatment. PAM can be classified into anionic, cationic, and non-ionic types based on its charge properties, while its molecular structure can be divided into network and linear types. 

Numerous experiments have shown that PAM can effectively optimize soil structure by increasing soil aggregates, reducing soil bulk density, and increasing permeability, thereby enhancing soil moisture content and corrosion resistance, ultimately promoting crop yield improvement.

1.The improvement effect of PAM on soil mainly depends on the absorption of polymers by the soil.

Although anionic PAM carries the same negative charge as the soil surface, it can still bind to the soil through the action of cation bridges. This binding is influenced by the molecular weight, ionic strength, and cation content of PAM in the soil.

2. Molecular weight is one of the key factors affecting the effectiveness of PAM.

High molecular weight PAM forms stronger bridging and protective networks between soil particles, but excessive molecular weight may limit its diffusion in the soil, forming a membrane as thin layer and reducing soil permeability. Therefore, for different soil types, it is necessary to choose appropriate molecular weight PAM.

3. Ionicity is also an important factor affecting the effectiveness of PAM.

Under the same molecular weight, high ion density may lead to mutual repulsion between PAM molecules, reducing their absorption of soil particles. However, a certain anionic degree is a prerequisite for the absorption of PAM by soil particles, so PAM with an ionic degree of 20% -30% is often used in practical applications.

In addition, cations in the soil also have an impact on the effectiveness of PAM.

Polyvalent cations can promote the adsorption between PAM molecules and soil particles, improving the effectiveness of PAM in soil.

Therefore, the effect of applying PAM in tap water medium is usually better than in deionized water medium.

In summary, PAM plays an important role in soil improvement through its unique molecular structure and charge properties. By selecting the appropriate type and dosage of PAM, and considering the characteristics of soil and media, its effects of soil retention, water retention, fertilizer retention, and yield increase can be maximized.

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