The C:N ratio

The relationship between carbon and nitrogen (the C:N ratio) is very importent for any type of compost. The ratio of different materials varies a fair bit, and there is quite a difference between fresh and dry (hay) matter of a material. The following list of ratios is made from material from different books and journals.

Cardboard/newspaper

800:1

Wood

760:1

Sawdust (fresh)

500:1

Sawdust (aged)

200:1

Wheat straw

130:1

Oat straw

50:1

Turnip (whole)

44:1

Fern

40:1

Carrot (whole)

27:1

Garbage (raw)

25:1

Horse manure

25:1

Potato tops

25:1

Seaweed

19:1

Cow manure

18:1

Garbage (green)

18:1

Poultry manure

15:1

Tomato

12:1

Young clover

12:1

Peanut hull meal

11:1

Sewage

10:1

Purslane

8:1

Urine

8:1

Chicken manure

7:1

Cotton seed meal

5:1

Fish (rennants)

5:1

Soya bean meal

5:1

Bone meal

4:1

Blood

3:1

Slaughter house waste

2:1

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