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| DOI： |
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| Impact of Vibration-tillage of Subsoils on Their Water Retention Curves |
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TENG Yun， ZHANG Zhongxue， SI Zhenjiang， HUANG Yan， WANG Bai
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College of Hydraulic & Architecture,Northeast Agricultural University, Harbin 150030, China;Heilongjiang Hydraulic Research Institute, Harbin 150080, China
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| Abstract: |
| 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, best-fitting parameters, equivalent pore size, soil moisture availability and specific water capacity of the five soils were assessed. The results showed a significant change in water retention curves of the same soil before and after the vibration-tillage. At the same matric potential, the soil water content after vibration-tillage was higher than that before the tillage. Vibrating the subsoil appeared to have significantly improved the availability of soil water, especially for the soda-saline and the black soils. Vibration-tillage of subsoil changed soil structure and increased soil porosity, thereby enhancing the ability of soil to retain and supply water. |
| Key words: soil water retention curve； vibrating subsoiling tillage； water holding capacity；soil moisture availability；specific water capacity |
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