This paper investigated the impact of vibration-tillage of subsoil on water retention curves offive different soils in Heilongjiang Province: Black soil, Chernozem soil, Paddy soil, Soda-saline soil, and sandy soil. Soil moisture under different matric potential controlled by tension table and pressure membrane apparatus was measured during both drying and wetting processes. The measured water retention curves were then fitted to the van Genuchten formula. The differences between the water retention curves,...