How to conduct a drench test
Soapy water probably isn't very good for beneficial soil microbes, so this isn't something you want to do all over, but it is an excellent test for measuring the presence of soil pests. Follow these steps to see what might be nibbling your plants' roots:
1.Gently mix 2 - 4 tablespoons of liquid dish soap into a gallon of water. [If your soil is especially dry, you may need to double the recipe.]
2.Mark off one square yard (3' x 3') of an area containing both healthy and unhealthy growth, with a rope, some string, or a garden hose.
3.Thoroughly saturate the area with the soapy water, using a watering can.
4.Monitor the area for the next 10 to 15 minutes, counting any insects that emerge.
from here: https://www.thedailygarden.us/...
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