I’m curious what folks favorite cover crop mixes that help build fertility and smoother perennial weeds. I had been doing buckwheat and field peas, but I think other better options are available. I look forward to reading all your blend recipes.
Have a look at, https://peipotatoagronomy.com/topic-soil-fertility/
and, http://www.speareseeds.ca/cover-crops, They are located in Harriston, Ontario
also be ware of allellopathy.
Your research results on allelopathic relationships between various crops and seeds will be one of the deciding factors in your choice of cover crop for whatever your main crop may be,