The Sanctuary TDN® 18-2-6 FAIRWAY 1000# 18-2-6 Fairway Grade - The Sanctuary TDN® 18-2-6 Fairway Grade is homogenous organic based product that combines the release characteristics and benefits of multiple nitrogen sources. These nitrogen sources include ammonium sulfate, methylene urea and nitrogen from protein meals. This multiple nitrogen release approach provides good residual color and a cost effective organic based product for fairway applications for all turf types.