C N Ratio Table

 

C:N Ratios to Balance Carbon and Nitrogen in Compost Piles
Blending compost ingredients to achieve the right balance between carbon and nitrogen is an art, but it’s based on science.
Knowing the C:N ratio of compost ingredients gives you some idea of how much of them to use in proportion to other materials in the pile.
Where a range is given, choose the midpoint of the range when estimating proportions.
It just takes time to learn by trial and error, so don’t get discouraged
 Garden Material  C:N Ratio
Carbon Midpoint Nitrogen
Soil 12 1
Food Wastes 15 1
Vegetable Wastes 15 1
Tree Trimmings 16 1
Cow Manure 20 1
Grass Clippings 17 1
Poultry Manure 25 1
Potato Tops 28 1
Garden Wastes 5-55 30 1
Fruit Wastes 20-50 35 1
Horse Manure 22-50 36 1
Shrub Trimmings 53 1
Leaves 40-80 60 1
Corn Wastes 90 1
Paper 125-180 150 1
Hardwood Bark 100-400 250 1
Sawdust 200-750 475 1
Cardboard (Corrugated) 560 1
Softwood Bark 100-1000 550 1
Newspaper 400-850 575 1
Hardwood Chips, Shavings 450-800 625 1
Softwood Chips, Shavings 200-1300 850 1