when were wood ashes, chalk, marl and animal excreta first used on soils to increase crop production?
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when were wood ashes, chalk, marl and animal excreta first used on soils to increase crop production?
My feeling is that it was in ancient China. Your answer, however, is probably Mesopotamia.
7 years ago via Forums | Front Porch Forum
Probably used by the Chinese before history was recorded.
7 years ago via Forums | Front Porch Forum