How NIR Interprets Soil Properties
Near-infrared spectroscopy measures molecular and mineral-related spectral responses in soil. These responses can be associated with organic matter, water, clay minerals, carbon-containing compounds, and other soil features that influence nutrient behaviour.
In practice, NIR may be used to support screening of soil variability, organic matter trends, moisture status, and some nutrient-related indicators. Its usefulness depends on the calibration model and whether the soil types, locations, and property ranges are represented in the reference dataset.
Soil is highly variable, so calibration and sample preparation are important. Moisture, particle size, mineralogy, organic matter, and sample mixing can all affect NIR readings. For fertiliser recommendations, regulatory reporting, or precise nutrient quantification, NIR should be validated against appropriate laboratory methods.
Assessing NIR for Soil Testing
For more detail on the method, review PAS’s overview of Near Infrared Spectroscopy technology. To compare suitable instruments, explore PAS’s NIR analysers through Portable Analytical Solutions, or get in touch to discuss soil type, calibration data, and nutrient assessment requirements.