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Faeces to fertilizer: Technical Details

Sanitized faeces should be applied prior to planting or sowing as the high phosphorus content is beneficial for root formation. 

If there is a limited amount of faeces fertilizer, it can be applied in holes or furrows close to the plants.

Treated faeces should be worked well into the soil, and not left on the surface.

Treated faeces should not be used for vegetables, fruit or root crops that will be consumed raw.

Precautions such as wearing gloves and thorough hand washing should be followed by the person handling the excreta.

A period of at least one month between application and harvest is recommended for treated faeces. This will further reduce the risk of pathogens due to microbial activity in the soil, UV-radiation from the sun, and desiccation. This one month period also is needed for the crops to utilise the nutrients

 

Application rate for faeces

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The application rate of faeces can be based on local recommendations for the use of phosphorus-based fertilizers and analysis of the phosphorus content of the faecal product. The average person produces around 50 liters of faeces each year. This amount of faeces will fertilize 1.5 3.0 m2 of crop if the application is made according to organic content. If application is instead based on phosphorus content, it will be enough to fertilise 200-300 m.2

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Faeces are often applied at much higher rates, at which the structure and water-holding capacity of the soil are also visibly improved. Organic matter and ash are often added to the faeces during collection and processing. These additions will improve the buffering capacity and the pH of the soil, which is especially important on soils with low pH.

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important: These guidelines should be adapted to the local conditions

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Further Readings:
Reuse of Faeces and Urine fromEcological Sanitation. Practical Action,UK, by Niall Boot [C.eldoc1/d70d/reuse-faeces-urine.pdf]

Guidelines for the Safe Use of Urine and Faeces in Ecological Sanitation Systems: 

EcoSanRes Fact Sheet 5.

http://www.ecosanres.org/pdf_files/Fact_sheets/ESR5lowres.pdf.

[C.eldoc1/d70d/undp1_050401zzz1B.pdf]

Guidelines on the Use of Urine and Faeces in Crop Production. EcoSanRes 

Fact Sheet 6.

http://www.ecosanres.org/pdf_files/Fact_sheets/ESR6lowres.pdf

 



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