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C:N relatinship

The ratio of carbon to nitrogen. If plants have a high C:N content, the plant contains a lot of C (carbon) and a little N (nitrogen). Plants with a lot of lignin, e.g. large oil radishes, have a high C:N ratio, and take a long time to be degraded in the soil. Vetch has a low C: N content and is quickly degraded in the soil.