Good compost should be: particle size less than 1.3 cm, pH 6.0 to 7.8, soluble salt concentration less than 2.5 ms/cm, low respiration rate, no weed seeds, pollutant concentration below national standards. The use of this compost is generally unrestricted. Respiration rate is obtained by measuring oxygen consumption. If the respiration rate is high, it means the compost is not stable yet.

Ripening time also affects the quality of the compost. Composts that decompose well tend to have lower pH, better compost structure, and higher nitrate-N content. The quality of the finished compost also depends on the environment in which it is stored. Although microbial activity basically stops during storage and the compost temperature drops, composting is not complete and will continue until all available carbon is used up. This means that at the end of the composting period, the compost must be kept dry or piled into small piles to promote aerobic respiration and further fermentation. The compost environment, once anaerobic, is likely to produce odors and some organic acids that are harmful to plants.

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