Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a soil to supply one or more plant nutrients essential to the growth of plants. Conservative estimates report 30 to 50% of crop yields are attributed to natural or synthetic commercial fertilizer. European fertilizer market is expected to grow to 15.3 billion by 2018.
Contributions by Vsmith, PBarak, and Paleorthid.
It is due to the ammonia.