Measuring Moisture in Soil

A portable field spectroradiometer like the PSR+ can be an important instrument for characterizing many soil properties in a single scan including soil moisture. Accurate measurement of moisture content in soil can provide critical information on soil successful water management through irrigation in agricultural applications.

Proximal soil analysis using a PSR+ agricultural spectroradiometer can provide information on the health of the soil and the associated vegetation. The PSR+ allows for rapid field measurement of moisture in soil by collecting spectral information related to the main water features at 1450-1460nm and 1920-1930nm. In addition to providing a measurement of water content, it also delivers information that can be used to derive leaf and canopy water content. The PSR+ can be used for ground truthing data from satellites or flyovers to ensure that it is accurate and complete.

The PSR+ is a full range (350-2500nm) NIR field portable spectroradiometer with high resolution and high sensitivity for clear and accurate spectra. Using the PSR+, spectra are collected quickly, accurately and without sample preparation.

All data is saved as ASCII files for use with 3rd party analysis software like R or ENVI. The PSR+ and all Spectral Evolution spectroradiometers include DARWin SP Data Acquisition software with 19 vegetation indices, including the Normalized Difference Water index (NWDI) and Water Band Index (WBI). The indices are accessed from pull down menus in DARWin.

Optional EZ-ID sample identification software includes access to mineral identification libraries – very useful for identifying clays, as well as a library builder module that allows for the creation of application specific libraries of known spectra that can then be used to identify new samples.

PSR+ Spectroradiometer

The PSR+ is designed for field use in vegetation, forest canopy, species identification and crop studies. The unit is lightweight and portable with two Li-ion batteries for a full day in the field, and no moving optical parts to breakdown. High resolution and unmatched sensitivity (NER specifications) make the PSR+ the spectroradiometer of choice for critical field work, including ground truthing of data from satellites.

DARWin SP Data Acquisition software is included with every spectrometer and spectroradiometer. DARWin includes a pulldown menu for access to 19 vegetation indices.