How many days does human feces and urine need to ferment before it can be used?

In China's traditional agriculture, human feces and urine have a very long history of use as fertilizer for plants. In ancient times, when there were no fertilizers such as nitrogen, phosphorus and potassium, in order to supplement the nutrients of plants, people would collect human feces and urine, livestock manure and urine together, and apply them to plants only after treatment. The plants grown this way were ecological and environmentally friendly, and the yield was still quite high.

At present, human feces and urine used as plant fertilizer are mostly used for vegetable growing. They cannot be applied directly and must be used only after fermentation treatment. The excrement excreted by the human body carries human bacteria, and the excrement of some sick people carries too many harmful pathogens. If it is applied to vegetables without fermentation treatment, when the vegetables absorb nutrients they will also absorb the harmful viruses from the human body at the same time. After people eat these vegetables, there is a great possibility of contracting diseases.

How many days can human feces and urine be used after fermentation?

The fermentation time is determined by the local weather and temperature. In summer it is generally 3——5 days, and it can be used only after being fully decomposed.

Fermentation method for human feces and urine

Flat-ground fermentation method for human feces and urine: dig some field mud on flat ground as the base, then spread rice straw, scatter plant ash, pile the feces upward, and when the pile is 10 cm thick, scatter lime on top, then spread another layer of rice straw, pile about 10 cm more of feces on top, and scatter lime again. A pile 1.5 m high is enough. Scatter lime on the outside of the manure pile as well, then spread rice straw over it, and then seal the outer edge with field mud. To prevent water, a layer of waterproof film can be added on the outside. Human feces and urine piled in this way can be completely fermented and thoroughly decomposed in half a month in summer. In winter, because the weather and temperature are low, the fermentation time will be extended by more than double.