通过维护土壤表面的结构和增加团聚体的稳定性，抑制土壤结皮的形成。聚丙烯酰胺在防止水土流失的过程中增加了土壤保水性和保肥性，改良了土壤，改善了土壤的通透性和抗旱能力，给作物的增产提供了条件。使用了聚丙烯酰胺后，可以提高作物出苗率。

Polyacrylamide can inhibit the formation of soil crust by maintaining the oil structure and increase the aggregate stability. Polyacrylamide increases soil water retention and water-stable aggregate in the process of preventing water and soil loss. Thus it improves the soil quality, soil permeability and drought-resistant ability and provides good condition for crop production. The emergence rate increased after using polyacrylamide.