Washington State University - Puyallup
Organic Farming Systems and Nutrient Management
Video: How To Take A Soil Sample.
By Dr Craig Cogger
Also check out: ♣ A Guide to Collecting Soil Samples for Farms and Gardens (PDF/HTML-Online). Fery, M., J. Choate, and E. Murphy. 2018. EC 628. Oregon St. Univ. Ext. Serv.