I have pure layered tan clay and access to a lot of horse manure that I compost a hundred yards at a time. My question is how much compost should I mix with the clay to get a pretty loose soil. The clay is like concrete when dry.
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A big problem with clay is the "bath tub" effect. This is where you have composted/amended the soil down inches and then plant-- but the clay is still down there acting like a bathtub, which then stunts the plant by stunting root growth not to mention holding more water than perhaps the plant can use, causing root rot. I know, that isn't your answer.
As I understand it, clay has all the nutrients that plants need but they can't get it because of the tight bonds.
I suggest you obtain some gypsum, dig your clay, mix in the gypsum with the clay and let it work a spell.
Read Ann Lovejoy! Her book turned all my old ideas upside down. You can drain bathtub beds by putting a post hole filled with rocks under them. Good soil should be one-third sand, one-third clay, and one-third decaying vegetation. You can guesstimate how much sand is in your clay by rubbing it between thumb and forefinger.
A better (and much cheaper) idea is to spread gypsum over the clay. This will break it up and make it easier to work with.
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