It is preferred by the fertilizer manufacturing industry since it is relatively easy to manufacture. Urea also has a high nitrogen content (46%), in comparison to other popular nitrogen sources (i.e. ammonium nitrate). On a ton for ton basis, urea contains 35% more nitrogen than ammonium nitrate. This has implications on the storage and transport of nitrogen fertilizer products. Urea is considered a relatively stable product to store and transport, and it is for this reason that the transportation of urea is considered very cost effective in comparison to its most common alternative, ammonium nitrate.