This paper really picks apart the effects of juglone, its production levels, area of effect, and all the possibilities of growing crops under its influence. Written with permaculture in mind.
I especially like their recommendation to plant black alder (Alnus glutinosa) as a nurse crop between your rows of black walnut. Since they’re sensitive to the allelopaths, they die out. But in the meantime you’ve grown poles for coppicing, and leave a whole stump and root system to slowly release nitrogen to the walnut crop -an excellent example of systematic development by filling niches in time.
Mortal Tree 
Perfect! I like the idea of growing different crops around different trees anyways. This could be another section of my orchard.
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I’m glad you like the idea. I’ll have to check in to see what fantastic systems you figure out.
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I’ll be posting as I go
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Have you eaten black walnuts? Are they yummy? My grandfather always said they were inedible and only suitable for making ink with so I never ate them when I had the chance.
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I can’t recollect ever eating more than a few pieces out of some I found out in the field. My neighbor though used to haul bags of them home her husband would pick through on winter nights. So yes, some people think they’re edible. Perhaps I’ll give them a more discerning try this fall.
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