Understanding how these soil tests are performed and what numbers you should be using is really important. Some numbers on these tests don't work for potting soils. Agronomist and Author Bill McKibben takes us through the Logan Labs tests and shares what you need to know when using a soil test with potting soils. SPOILER: It's not the same as agricultural soils and not all the numbers are accurate! https://www.kisorganics.com/pages/cannabis-cultivation-and-science-podcast-episode-61