Alfalfa meal is a great organic fertilizer. Alfalfa is also something that can be grown at home if you have the space. Makes great feed as well as great fertilizer.
I am not big on soy either, but I am not allergic to it. I did have some edame that was in a container of assorted veggie platter for dipping. It was good in stir fry, but is not something that I would normally buy, nor grow. For beans I like Pintos and Navy or Great Northern as well as green snap beans.
I have a little less than 200 sq. ft, and 96 sq. feet of that is quite close to a walnut tree. I work around that by using containers for the Tomatoes and Peppers at least once every 3 years.
Hubby has about 1000 sq. ft. for regular garden, and then he has his fruit trees, grapes, and berry bushes. We are blessed with several native species: Walnut trees, butternut, hickory and persimmon trees. Blackberry bushes, honey dew bushes, wild roses.
I don’t add high nitrogen materials to the space where I plant those carrots and other root veggies. After the heavy feeders such as tomatoes and peppers, I just add in some compost and plant the root veggies like carrots.
Do you ever grow any winter cover crops?