The following is quoted from the linked article. There's a link in the article to a video showing how to do it, but I've linked to the article for the overview:
"60 Minute Worms is a tracker with a traffic-light rating system to signal healthy soil management practices. The assessment involves digging 10 spade-size topsoil pits, then sorting and identifying the three types of earthworms (epigeic, endogeic and anecic). The results reveal the likelihood of earthworm function in your soils, rated from red (unlikely) to orange (possible) to green (likely).
The traffic light system rates how healthy the soil is.
Tillage intensity, crop rotation and organic matter applications all influence earthworm communities in arable soils. 60 Minute Worms shows how land management decisions above the ground influence the millions of earthworms that are engineering the soil ecosystem below."
By taking part in 60 Minute Worms, practitioners can see how their field ranks for earthworms, individual results can be compared as part of a national survey, and as a community, they can help improve the likelihood of benefiting from earthworm function in agriculture."
More detailed info on the various types of worms in the soil:
"60 Minute Worms is a tracker with a traffic-light rating system to signal healthy soil management practices. The assessment involves digging 10 spade-size topsoil pits, then sorting and identifying the three types of earthworms (epigeic, endogeic and anecic). The results reveal the likelihood of earthworm function in your soils, rated from red (unlikely) to orange (possible) to green (likely).
The traffic light system rates how healthy the soil is.
Tillage intensity, crop rotation and organic matter applications all influence earthworm communities in arable soils. 60 Minute Worms shows how land management decisions above the ground influence the millions of earthworms that are engineering the soil ecosystem below."
By taking part in 60 Minute Worms, practitioners can see how their field ranks for earthworms, individual results can be compared as part of a national survey, and as a community, they can help improve the likelihood of benefiting from earthworm function in agriculture."
Earthworms Count: How Healthy is Your Soil? - Connecting Research
By Jeremy Lelean, Geography and Environmental Science, University of Reading Soil, from being an overlooked area of research, is now considered an area of vital interest in the solution to...Read More >
research.reading.ac.uk
More detailed info on the various types of worms in the soil: