Great work and awesome concept, guys! I love the concept of recycling our Nitrogen, Phosphorus and potassium resources. You should bring your research up here to Western Canada. There's a lot of animal farming (Alberta beef, for instance) and phosphate mining for fertilizers. Not sure how much farmers here are currently doing a forever recycling of animal manure as plant nutrient sources. We also have a lot of grazing land up here, so it might be worth expanding your research to Canada and taking a look at the situation up here.
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