While composting organic matter, a farmer generally stacks layers the organic matter alternating with soil. Soil has literally thousands of different species of organisms and depending on the availability of the elements in the substrate, the appropriate organisms multiply. If the organic matter in the compost is deficient in N, but has enough organic C, the N2-fixing organisms would have an upper hand in this substrate, because others won't be able to survive in it. Thus, starting with organic matter that is deficient in N, one can have a compost that is relatively rich in N. Therefore, one should not worry too much about the C/N ratio in the starting material. Yours A.D.Karve
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