Hey all. Just finished the Understanding Soil live stream, and I immediately starting searching for soil labs. I found that my county does free testing of up to 5 samples (Seattle, King). $20 for each sample thereafter. One thing I do not know is how long the program lasts…if it will last until the spring so I can send some of my used soil.
Samples are sent to A and L Western Laboratories in Portland, OR to test for Nitrogen, Phosphate, Potassium, Magnesium, Calcium, Sodium, Sulfur, Organic Matter, pH, and Cation Exchange Capacity. The laboratory will analyze your soils and provide recommendations specific to your plant needs.
Hopefully there are other programs out there wherever you’re located!