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What is the main source of the phosphorus of fertilizers?

dbarker says 2015-09-24 20:21:11 (CST)

I'd guess manure or rock phosphate


3 years ago via Forums | Front Porch Forum

JerryHicks says 2015-09-25 04:44:29 (CST)

Phosphate rock.

3 years ago via Forums | Front Porch Forum

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