Frass is good earthworm food, earthworms are good for soils.
Frass: Earthworms
Full article
https://www.mdpi.com/2073-4395/10/6/783
Reference
(Dulaurant, et al. 2020)
Dulaurent, A. M., Daoulas, G., Faucon, M. P., & Houben, D. (2020). Earthworms (Lumbricus terrestris L.) mediate the fertilizing effect of frass. Agronomy (Basel), 10(6), 783-. https://doi.org/10.3390/agronomy10060783
This article is open source, so hopefully I haven't made any IP infringements.
