Quick Answer
Fully decomposed humanure compost is dark brown or black, crumbly, and has little to no distinguishable human waste fragments, with an earthy or slightly sweet aroma.
Characteristics of Mature Humanure Compost
Mature humanure compost typically has a pH between 6.0 and 8.0, which is suitable for most plants. It is also teeming with beneficial microbes, which help to suppress pathogens and improve soil structure. A fully decomposed compost pile can lose about 70-80% of its original volume due to the release of carbon dioxide and water vapor during the decomposition process.
Testing for Decomposition
To determine if your humanure compost is fully decomposed, perform the “smell test” by gently breaking apart a handful of compost. If it has a strong, unpleasant odor, it is not yet mature. If it has a slight earthy or sweet smell, it is close to being mature. You can also perform the “squeeze test”: a mature compost should crumble easily when squeezed, whereas immature compost will form a ball.
Precautions and Safety Considerations
When handling mature humanure compost, it is essential to take safety precautions. Wear gloves and a face mask to minimize exposure to potential pathogens. Avoid inhaling compost dust, which can be rich in pathogens. Also, be sure to mix the compost with other materials, such as topsoil or peat moss, before using it in gardens or as a fertilizer to further reduce the risk of disease transmission.
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