Reference: Veganic amendments

A handy list of various options for veganic amendments -- 

from https://www.groworganic.com/blogs/articles/vegan-organic-gardening:

Vegan-friendly products and methods

• Down To Earth Vegan Mix fertilizer
• Alfalfa meal
• Cottonseed meal
• Neem seed meal
• Soybean meal
• Corn gluten meal
• Kelp meal
• Arctic humus
• Soil inoculants and mycorrhizae - read the label first, as some products contain animal-derived fertilizers too. Chappy’s and MycoMinerals are both vegan-friendly choices.
• Mulches–like Mega Mulch
• Cover crops, and cover crop inoculants
• Biochar
• Compost made from green waste (not manure)
• Composting at home
• Liquid kelp
• Calphos, gypsum, greensand and other mineral fertilizers. Many vegans avoid mined minerals though because of the effects mining has on local animal life and the earth as a whole.
• Humic Acids, such as Humax (also a mined product)
• Peat moss (vegan, but controversial due to the effects of harvesting it on the environment)
• Coco coir or coco peat
• Homemade potting mix: combine PVFS compost, perlite (or substitute vermiculite), coco peat (coco coir), and your choice of nutrient-rich ingredients such as limestone.
• Any pesticides that are barriers or deterrents (gopher wire, for example).
• Pest prevention techniques such as companion planting, removing fallen leaves and other pest hiding places, crop rotation, etc
• Biological controls (introducing new beneficial insects or pest-specific diseases) is debatably veganic. It is preferred to encourage native species and only introduce new ones as a last resort.
• Mushroom kits (except for the white buttons and portabella kits)

And, here's what looks to be a Canadian source of organic soybean meal:  https://boogie-brew.ca/product/soybean-meal