To find out when your post office is open: 1  Enter your location in Find a Post Office. 2  A map will appear displaying post offices near you. 3  Select Hours and Services. 4  Select your desired location to view the hours of operation.
Testing Soil pH with a Commercial Test Probe. 1  1. Dig a small hole in the soil. 2  2. Fill the hole with water. 3  3. Insert the test probe into the mud.  4. Hold it there for 60 seconds and take a reading. pH is usually measured on a scale of 1-14, though the tester may not include this entire range.
In soil you want to maintain a pH of 6-7. If you do notice nutrient problems, the first thing to do is check the pH of the water going in and out! Learn how to check the pH of your soil. If your pH is outside the 6-7 range, you may need to adjust the pH to avoid further nutrient lockout on your cannabis plants. But since you're growing in organis soil, if you do want to adjust pH, you should use an organic source.