From Tim J Fowler's page, links at the bottom:
http://aces.nmsu.edu/pubs/_h/H-110.pdf
Quote:
While most organic materials in the pile vary in their
carbon:nitrogen ratios, they must be balanced to produce
the ideal of 30:1. Most dry or woody materials are
high in carbon, while green wastes or livestock manures
are relatively low (table 1). Because plant materials vary
in C:N ratios due to water content and growth stage,
tables of C:N ratios can be used only as guides in mixing
materials. Thus, composting is as much an art as it
is a science.
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Quote:
Table 1. Carbon:nitrogen ratios for selected organic
wastes (by weight).
Material C:N Ratio
Low C:N materials
Grass clippings 12–15:1
Food scraps 15:1
Vegetable wastes 11–20:1
Coffee grounds 20:1
Cow manure 18–20:1
Horse manure 25:1
Poultry manure 15:1
High C:N materials
Leaves 30–80:1
Straw 40–100:1
Corn stalks 60:1
Paper 170–200:1
Sawdust 200–500:1
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