Abstract:

One of the major reasons of low-yield crops is dissipation of surface soil water evaporation. PAM is one of the insurance agents, its a super-absorbent and water-retention capacity, which can inhibit the evaporation of soil evaporation, increasing soil evaporation, enhance soil water retention function, it plays an important role on the regulation of sandy soil evaporation. In this study, the alluvial soil collected from the Three Gorges Reservoir Region was chosen to figure out the effect of different doses and dosage forms of PAM on the water preserving capacity, so as to provide theoretical evidence for the spread and exploitation of PAM on the agricultural irrigation. The results showed that PAM could inhibit the evaporation of soil evaporation. Compared with the control, the accumulated evaporation of alluvial soil was decreased by 2.37%~12.45%; The difference between different doses of PAM was significant and 200mg/kg was the most prominent dose. PAM with the same molecular weight but different charge density was treated, the accumulated evaporation of alluvial soil was decreased by 7.34%~17.81%, while 40% was the most prominent dosage of alluvial soil, When PAM with the same charge density but different molecular weight was treated, the accumulated evaporation of alluvial soil was decreased by 12.25%~18.53%, while 10 million was the most prominent dosage.