NITROGEN 21%. CrS, Composition: Nitrogen 21% (ammonia N 21%, DMPP 0.8% with respect to ammonia nitrogen); sulfur 60%. Nitrogen fertilizer of controlled release with sulfur. With nitrification inhibitor (DMPP), which inhibits the action of nitrosomonas, delaying the transformation of ammoniacal nitrogen to nitric, which avoids losses due to nitrate leaching, achieving greater use of the nitrogen fertilizer units while reducing the nitrate contamination.