Can You Safely Combine Humanure with Animal Manure?

Composting Protocols Matter

Combining humanure with animal manure requires a clear understanding of composting protocols. For safe and efficient composting, the carbon-to-nitrogen (C:N) ratio should be maintained between 20:1 and 40:1. This can be achieved by mixing humanure (rich in nitrogen) with animal manure (rich in carbon) in a ratio of 1 part humanure to 4 parts animal manure.

Temperature Management

To minimize pathogens and weed seeds, the compost pile should be maintained at temperatures above 131°F (55°C) for a minimum of 24 hours. This can be achieved by using a combination of materials with different carbon and nitrogen levels. For example, adding a 6-inch layer of animal manure, followed by a 2-inch layer of humanure, and repeating this process for a total of 3-4 cycles. Regular turning of the compost pile will help maintain optimal temperatures.

Pathogen Reduction Techniques

Pathogens in humanure can be reduced through a combination of high temperatures, moisture, and oxygen levels. To achieve this, the compost pile should be kept moist but not waterlogged, and turned regularly to ensure adequate oxygenation. Additionally, incorporating bulking agents like straw or shredded newspaper can help absorb excess moisture and reduce odors. Regular testing for pathogens and weed seeds can ensure that the compost is safe for use in gardens and agricultural applications.