Water Potential Instruments
- Measurements:
Water potential describes the force that drives water movement. It is the most fundamental and essential measurement in soil physics.
Unfortunately, it's also a tricky thing to measure. The chart on the right (click on it to view the full image) shows range and accuracy for available instruments and sensors. You can find more information about each instrument's advantages and limitations on the individual product pages. For more information on water potential theory, see the resources list on the right.
Comparisons
Support
Material Safety Data Sheet
- MSDS 0.5m KCl
- MSDS 6.0m NaCl
- MSDS Activated Charcoal
- MSDS Decagon Cleaning Solution
- MSDS Distilled Water
- MSDS Indicating Drierite
- MSDS 8.57m LiCl
- MSDS 13.41m LiCl
- Material Safety Data Sheets
Application Notes
- Classification of Expansive Soils using the WP4C Dewpoint Water PotentaMeter
- Determining the -15 Bar (Permanent Wilt) Water Content of Soils with the WP4
- Effects of Sample Disturbance on Soil Water Potential Measurements
- Field Portability for the WP4C PotentiaMeter
- Isotherm Analysis: New (and Old) Ways to Look at Soil
- Modeling Available Soil Moisture
How-To Articles
- Generating a Soil Moistures Characteristic Using the WP4C
- Measurement of Leaf Water Potential using the WP4C
Manuals
Information Sheet
Request Support
Email: support@decagon.com
Phone: 800-755-2751 or
509-332-2756
Fax: 509-332-5158
Or send us an information request:
Education
Newsletters
- Water Potential Theory
- Geoenvironmental Engineering Newsletter-2007
- Soils News-1999
- Soils News-2004
- Soils News-2005
- Soils News-2006
- Soils News-2008
- Soil & Plant Water Potential Newsletter 2011-2012
Virtual Seminar
- January 25, 2011: Virtual Seminar: Measurements and Models for Macropore Infiltration in Soil
- December 10, 2010: Virtual Seminar: Accurate and Reliable Soil Moisture Characteristic Curves (Moisture Release Curves) using Vapor Pressure Methods
- September 28, 2010: Virtual Seminar: Quick Methods for Determining Plant Available Water
Newsletter Articles
- January 11, 2007: Measuring Specific Surface of Soil with the WP4C
- Newsletter-Field Capacity Is Not Saturation
- Newsletter-Measuring Soil Water Potential - One Hundred Years of Progress
- Newsletter-The Wilting Coefficient and Its Relation to Soil Water Content and Potential
List of Cited Publications
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HYPROP
Generate detailed moisture release curves on undisturbed soil samples in a standard 250 mL sample ring, typically within a few days. Range: 0 to -85 kPa. HYPROP also determines unsaturated hydraulic conductivity values for the soil sample. » Learn more
HYPROP-FIT Software
Curve fits for all water potential data. New HYPROP-FIT Software for generating soil moisture release curves. » Learn more
Vapor Sorption Analyzer
The Vapor Sorption Analyzer (VSA) brings click and read efficiency to soil moisture release characteristic curves. In 24 to 48 hours, the VSA generates up to 200 data points (water potential vs. water content) for both adsorption and desorption. The VSA works in the dry (-10 to -475 MPa) range. You can create automated soil-water characteristic curves and generate all the correlations with clay activity, surface area, and swelling potential. With the new static feature, you can hold humidity constant and look at the way soil takes up water into its crystal structure (2:1 clays) and monitor water content change over time. » Learn more
WP4C Dewpoint Potentiameter
Fast, Accurate Water Potential Measurements Use the WP4C to measure water potential in 5 to 10 minutes. Range: -0.1 to -300 MPa* WP4C video Versatile The WP4C can be used to measure the water potential of any porous material. It's typically used to analyze soil, soilless substrates, plant… » Learn more
AquaLink Software
New AquaLink Software Traditionally, WP4C data storage and download have been a hassle. The WP4C saves data internally, but you had to keep track of the order in which you read the samples to make sure that the right sample was associated with the right reading. Most people found it easier to… » Learn more