## Composting Balance CalculationsAlken-Murray recommends a C/N ratio
of 20 to 30 for composting of manure and various high carbon wastes To balance
the C/N ratio to the desired level of 30, use the following algebraic equations,
courtesy of the 6/18/2008
Example waste ..........C/N ratio
Let: A = weight of poultry litter 1 - A = weight of wheat straw A + (1 - A) = 1 Formula = A x [manure C/N ratio] + (1 - A) x [wheat straw C/N ratio = 1 x 30 7.5A + 130 - 130 A = 1 x 30 (desired compost ratio) 7.5 A - 130 A = 30 - 130 -122.5 A = -110 which is the same as, 122.5 A = 110 Parts by weight ______________________ litter: A = 110 / 122.5 = 0.90 0.90 / 0.90 = 1.00 straw: 1 - A = 1 - 0.90 = 0.10 0.10 / 0.90 = 0.11 _____ _____ 1.00 1.11 Therefore, in this example, for
every 90 lbs. of manure, 10 lbs. of straw would be required to bring the
C/N ratio to 20. Keep in mind that for this to work, extra fungi and/or
bacteria with strong cellulase enzyme are needed to break this difficult
carbon source into a useable offset for the excess nitrogen and phosphorus
in the swine (or chicken) manure, using | ||||||||||||||||||||||||||||||||||||||||||||||

To balance the moisture content, use these algebraic computations: Average moisture content of litter/straw mixture = 0.90 x 50% + 0.10 x 10% = 46 % Let: B = weight of litter/straw mixture 1 - B = weight of water needed B + (1 - B) = 1 Formula = B x 46 + (1 - B) x 100 = 1 x 50 46B + 100 - 100B = 50 - 100 -54B = -50 which is the same as, 54B = 50 Parts by weight ______________________ litter/straw: B = 50/54 = 0.92 0.92 / 0.92 = 1.00 water: 1 - B = 1 - 0.92 = 0.08 0.08 / 0.92 = 0.08 _____ _____ 1.00
Litter Compost Recipe:
Part by Pounds per 100 lbs. compost mix manure: 0.9 x 0.92 x 100 = 83 lbs. |

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