A comparison of water potential instrument ranges

A comparison of water potential instrument ranges

Water potential is the most fundamental and essential measurement in soil physics because it describes the force that drives water movement. Making good water potential measurements is largely a function of choosing the right instrument and using it skillfully.  In an ideal world, there would be one instrument that simply and accurately measured water potential over its entire range from wet to dry.  In the real world, there is an assortment of instruments, each with its unique personality.  Each has its quirks, advantages, and disadvantages.  Each has a well-defined range.

Below is a comparison of water potential instruments and the ranges they measure.

Figure 1. A range comparison of water potential instruments such as the HYPROP, WP4C, VSA, MPS-6 and TEROS 21 matric potential sensor, and the tensiometer

Automated everything

After setup, the HYPROP generates a moisture release curve in only three to five days. To save you even more time, it can operate while being left unattended.

It’s not immortal, but almost

Specifically designed for field-use, the T4 tensiometer ceramic and shaft are engineered to be virtually indestructible when it comes to harsh weather. Plus, it can be filled without ever having to remove it, …