Clay can be turned into something resembling a lighter soil by blending enough organic matter into it. Not the essential little bit that enlivens a soil containing less than half clay, but huge amounts, a layer several inches thick. But remedying clay this way is not wise for several reasons. First, because in the long run this practice is expensive. The high level of organic matter you must create to improve the structure of clay decomposes rapidly and requires replacement every year. The first year might take spading in a layer three to four inches (7.5 to 10 centimeters) thick to
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