It is the calcium salt of the cyanamide () anion. It is produced in soil by decomposition of cyanamide. The stable compound cyanamide, whose minor tautomer is carbodiimide, is an isomer of diazomethane. Graphitic carbon nitride can be made by polymerization of cyanamide, dicyandiamide or melamine. Cyanamide degrades via hydrolysis to urea, an excellent fertilizer. It is hydrolysed to cyanamide, HNCN. Its main use industrially is in the production of acetylene and calcium cyanamide. The main use of calcium cyanamide is in agriculture as a fertilizer. Calcium cyanamide is prepared from calcium carbide. Diazomethane is both isomeric and isoelectronic with the more stable cyanamide, but they cannot interconvert. Frank and Caro also noted the formation of ammonia from calcium cyanamide. The main reaction exhibited by cyanamide involves additions of compounds containing an acidic proton. Consequently, most commercial cyanamide is sold as an aqueous solution. When first invented, the Haber process competed against another industrial process, the cyanamide process. This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton.