You have me. CNR =Critical Nuttrient Range or Carbon Nitrogen Ratio. CRF Controlled Release Fertilizer.
CSRN= Controlled Slow Release Nitrogen?? Urea Formaldehyde as form of nitrogen?? but I am Guessing.
HWIN ?? I am still thinking on. Oops Hot Water Insoluble Nitrogen. I am used to seeing CWIN = Cold Water Insoluble Nitrogen. U or UF is the Nitrogen form
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