Originally Posted by JCB
I have read that you need about 8% clay. I know our soil is not loamy at all in the summer without rain it turns as hard as a rock and it is a clay color. Non scientific observation.

Try adding a bit of water to a handful, Try to roll it into a pencil and see if it stays together. If it breaks apart, add a bit more water and keep trying. If you can roll it into a pencil then it should have enough clay to compact and seal given the correct water content.

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