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King City, Mo | Well, I can't find the exact links....I'm thinking it was a ft.
Water holding capacity of soil organic matter
Soil scientists report that for every 1 percent of organic matter content, the soil can hold 16,500 gallons of plant-available water per acre of soil down to one foot deep. That is roughly 1.5 quarts of water per cubic foot of soil for each percent of organic matter. Increasing the organic matter content from 1 to 2 percent would increase the volume of water to 3 quarts per cubic foot of soil. Rodale Institute presenters, on the other hand, assume that 1 pound of carbon can hold up to 40 pounds of water. That calculates out to be approximately 38,445 gallons of total water per acre six inches deep. The point here is that organic matter holds a lot of water, thus, the amount of organic matter in a soil directly influences the availability of water to a crop over time. However, organic matter in droughty soils breaks down so rapidly that getting above 2 or 3 percent is difficult to do, but getting to 2 to 3 percent can have major positive impacts.
http://msue.anr.msu.edu/news/compost_increases_the_water_holding_ca...
Im thinking soil tye like sand vrs prairie soil vrs timber would all act a little different.
The clapperton video
http://www.youtube.com/watch?v=rhtQ7kfCXTc
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Soil Testing for Water Holding Capacity
