Quality Assurance and Quality Control Manual Recommendations (PDF) (available to NAPT program participants - login required)- A manual of recommended guidelines for writing and maintaining a laboratory QA/QC manual. Developed by the Soil Science Society of America for soil, plant, and water testing laboratories. Second edition (2022). *Also available as a hardcopy version printed in color on waterproof paper - Contact us at Send Message for more information or place an order. Participants new to the program receive the waterproof copy as an added benefit.
