In order to reveal the effect of chemical measures on prevent tillage erosion of sloping fields in purple soil

the impacts of polyacrylamide (PAM) on soil structural stability and tillage translocation were studied in the plots with five slope degrees as 5°

10°

15°

20° and 25° using magnetic tracer and stimulated tillage experiments. The results indicated that： (1) Mean translocation distances of plots added PAM were significantly lower than that of CK (without PAM application)

and the tillage translocation significantly decreased by 49.16 % and 67.96% on 20° and 25° slope plots

respectively; (2) Compared with CK

the content of non water stable aggregate that less than 0.25 mm declined by 33.74%

46.67%

37.56%

52.70%

and 62.50% on the 10°

15°

20°

and 25° slope plots added PAM

respectively. In the plots added PAM

the percentage of mean aggregate destruction (PAD) decreased by 60.05%

while mean weight diameter (MWD) and mean geometric diameter (MGD) increased by 41.94% and 55.09%

respectively

compared with CK; (3) Tillage translocation was positively linear correlated with PAD

while was negatively correlated with MWD and MGD (P＜0.05). These results suggested that the application of PAM could effectively reduce tillage translocation

enhance soil structure stability

and reduce soil erosion. PAM can be used to control tillage erosion on the steep slope (over 20°).