MicrotackDesign

CARBON / NITROGEN Ratio for Various Compostable Materials 


High Organic CarbonHigh Organic Nitrogen
Fruit wastes35 : 1Humus10 : 1
Leaves40 : 1Alfalfa Hay12 : 1
Sugar Cane Residues50 : 1Alfalfa13 : 1
Cornstalks60 : 1Kitchen Scraps15 : 1
Oat Straw80 : 1Green Sweet Clover16 : 1
Straw80 : 1Rotted Manure15-25 : 1
Paper170 : 1Grass Clippings19 : 1
Sawdust500 : 1Mature Sweet23 : 1
Wood700 : 1Legume-Grass Hay25 : 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 Clippings75% X 19   =14.25
Leaves25% X 40   =10.00
Combined Carbon/Nitrogen Ratio :24.25 : 1