How much compost or manure would one need to add to raise the Soil
Organic Matter SOM content of an acre of soil 6" deep by 1%?
SOM percentage is calculated by weight, not volume. The convention
used is that 1 acre of soil 6-7" deep weighs 2,000,000 (two million)
pounds. Or a hectare of soil 15cm deep weighs 2,000,000 kg. One
percent of that is 20,000 lbs/acre or 20,000 kg/ha
Compost and manure can be assumed to be around 60% moisture and 40%
dry organic matter. So
20,000 / 0.40 = 50,000
To add 1% organic matter to the top 6" or 15cm of soil would require
about 50,000 lbs/acre or 50,000 kg/ha of organic matter at 60%
moisture content.
Probably makes more sense to grow it in place.
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