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Percentage of additional organic matter added to soil that would allow the soil to absorb an extra 20,000 gallons of rainwater on an acre of land, according to a report on regenerative farming in the magazine Civil Eats. In soils with lots of organic matter, rainwater tends to be stored in the top 12 inches of the soil where it is then available to help crops withstand dry spells. Soils rich in organic matter are also effective “sinks” for carbon.