Application of polyacrylamide(PAM) in soil can not only improve rainfall infiltration rate

but also reduce soil erosion. Usually

PAM is applied on soil surface. In order to study the effects of the mixtures of PAM with other soil conditioners on rainfall infiltration rate and soil erosion

six application treatments were evalua-ted by mixing PAM(22.5kg/hm2) with superabsorbent polymers(45kg/hm2)

fly ash(1500kg/hm2) and hu-mic acid(900kg/hm2). Results showed that the application of PAM mixed with soil conditioners could sig-nificantly increase rainfall infiltration rate and reduce soil erosion.Rainfall infiltration rate was 1.8 to 2.7 times higher than the control

while soil erosion rate was reduced by about 50% to 70%. The mixture con-taining PAM

fly ash and humic acid had the most significant effect on the increase in infiltration rate. Mixing PAM with superabsorbent polymers led to the greatest reduction of soil erosion.Moreover

there was no significant differ-ence when PAM was applied alone and mixed with fly ash and humic acids.Overall

the application of PAM mixed with fly ash had the best effect on the increase of rainfall infiltration and reduction of runoff. Soil erosion re-sistance was the best when PAM was mixed with superabsorbent polymer.