Farmers rely on phosphorus fertilizers to enrich the soil and ensure bountiful harvests, but the world’s recoverable reserves of phosphate rocks, from which such fertilizers are produced, are finite and unevenly distributed.
From https://www.sciencedaily.com/releases/2019/04/190417171045.htm
from
https://healthnews010.wordpress.com/2019/04/18/why-researchers-are-mapping-the-worlds-manure/
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