Soil respiration & water-extractable organic carbon and nitrogen
Soil microbes breathe in oxygen and release carbon dioxide, similar to the way humans do. The SHA test measures how much CO2 your soil is releasing. Higher CO2 levels indicate more microbial activity.
The SHA test includes a modified aggregate stability measurement, which is an indicator of how well soil particles hold together. Improved aggregate stability enhances the soil’s ability to take in water, making this a valuable measurement.
When it comes to soil nutrients, it is important to not only know what is in the soil, but also what is usable by the crop. That’s why SHA evaluates nutrients using extractants that are widely accepted, correlated, and specifically calibrated to crop response.