Assertion: manure | /r/CreatedBy | an acre of feed crop
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Source sentences:
text: If we divide the tons of manure needed to maintain one acre of SOM by the tons of manure produced by an acre of feed crop (using the average of best and worst manure production rates from previous post, 3.6 tons per acre, manure at 33% moisture), we get the number of acres of manure (through feed) production it takes to maintain one acre of soil organic matter.