**5. Conclusions**

In this study, we observed the infiltration processes of black soil slopes under bare and residue-covered conditions by simulated rainfall experiments. The optimal infiltration model for the residue-covered black soil was derived in combination with the Philip model and the residue cover infiltration factor (*RCFi*) after comparisons. The model was suitable for the estimation of cumulative infiltration amounts under residue cover conditions for the black soil. The model was meaningful for the infiltration estimation, and thus provided effective governance for soil erosion management of the black soil.

**Author Contributions:** Conceptualization, Y.X. (Yun Xie); data curation, Y.X. (Yan Xin); formal analysis, Y.X. (Yan Xin); funding acquisition, Y.X. (Yun Xie); investigation, Y.L.; methodology, Y.X. (Yan Xin) and Y.L.; supervision, Y.X. (Yun Xie); validation, Y.X. (Yan Xin); writing—original draft, Y.X. (Yan Xin); writing—review and editing, Y.X. (Yun Xie).

**Funding:** This work was supported by the National Key R&D Program (No. 2018YFC0507000) and the China Postdoctoral Science Foundation (No. 2018M630102).

**Acknowledgments:** We are thankful for the valuable comments of anonymous reviewers.

**Conflicts of Interest:** The authors declare no conflict of interest.
