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Message: [QUOTE="DirtMechanic, post: 216509, member: 5568"] A fine point about the soil amendment calculators out on the web is that they weight clay to need about 1.8 times the amendments that a loam or other soil may need. This is just related to density. It is useful to know how much a 12 inch by 12 inch by 6 inch deep section of your soil weighs in kilograms. You really do not want to pass 30 percent organic matter, and really for lawns 5 percent or so might be considered rich. But obviously a percentage of one soil would be different than another type soil. [/QUOTE]