What does C:N stand for?

Carbon to Nitrogen

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

They lower the pH of the alkaline sludge, free up mineral ions, including potassium, decrease the ratio of carbon to nitrogen of the material, and boost the amount of nitrogen and phosphorus available for plant growth within a matter of weeks.

Indian scientists find earthworms can be used to produce compost from ...

Create a good carbon to nitrogen ratio, browns to greens.

Compost tips for gardeners