Carbon Nitrogen Ratio

Agromimicry | Aquamimicry | Livestock | Wastewater | Ornamental Pond | Odor Management

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CARBON / NITROGEN Ratio for Various Compostable Materials

High Organic Carbon		High Organic Nitrogen
Fruit wastes	35 : 1	Humus	10 : 1
Leaves	40 : 1	Alfalfa Hay	12 : 1
Sugar Cane Residues	50 : 1	Alfalfa	13 : 1
Cornstalks	60 : 1	Kitchen Scraps	15 : 1
Oat Straw	80 : 1	Green Sweet Clover	16 : 1
Straw	80 : 1	Rotted Manure	15-25 : 1
Paper	170 : 1	Grass Clippings	19 : 1
Sawdust	500 : 1	Mature Sweet	23 : 1
Wood	700 : 1	Legume-Grass Hay	25 : 1

The C/N ratio need not be exact.

EXAMPLE : How to calculate combined C/N ratios.

Material to be composted Percent used C/N ratio

Grass Clippings	75% X 19 =	14.25
Leaves	25% X 40 =	10.00
Combined Carbon/Nitrogen Ratio :		24.25 : 1

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