The ratio is referred to as C:N. The value of N is always one, whereas the value of carbon or carbohydrates is expressed in a value of about 10 up to 90; the ratio must be less than 30:1 to prevent the manure bacteria from depleting existing nitrogen in the soil.
N的值總是為1，而碳或碳水化合物的值表示為約10至90；該比例必須小於30：1，以防止糞便細菌在土壤中消耗現存的氮。