| Preliminary study on selection and accuracy of different methods for measurement of soil water potential |
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| DOI：10.7606/j.issn.1000-7601.2011.04.35 |
| Key Words: tensiometer pressure film centrifuge soil water potential |
| Author Name | Affiliation | | LIU Sichun | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | GAO Yajun | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Yongyi | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | MA Aisheng | College of Resources & Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The study on three commonly used measurement methods for soil water potential shows that the accurate degree of pressure film is the highest, centrifuge is the second, while tensiometer is the lowest. The soil water characteristic curve results from the measurement of pressure film is almost in conformity with that of the origin one, but it takes as long as half a year to determin completely the characteristic curve. To determin soil water characteristic curve with centrifuge may result in deviation compared with pressure film. The continuous change of soil bulk density and rise of soil temperature in the process of te measurement cause differences in the result, but its measurement period is shorter. The tensometer is extensively applied to determine the time of farmland irrigation. Though its result is not accurate enough, it is still a practicable instrument to measure soil potential in agricultural production and laboratory. If a preasure sensor is used to hold the balance and the swap of moisture between soil and the tensiometer cup is ignored, the accuracy will show an exaltation. |
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