Quote:
Originally Posted by obdiah
Richard is correct as to natural n sources chicken liter is about the highest and usually runs from 3 to 4 % N
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Theoretically, pure urea with 46% N can be extracted from urine, in which case, it can be called "organic." I see "organic urea" sold in China (Alibaba).
The word "organic" is ambiguous in that it may also refer to any carbon based compound, in which case, synthetic urea is "organic." I mention this only to alert you to potential Chinese deception because I assume that is not what the OP means by "organic."