DuckDuckGo hides the origins, but does have this:
Quote:
https://www.gardenmyths.com › synthetic-fertilizer-petroleum
Synthetic Fertilizer Ingredients - Are They Made From Petroleum?
Nitrogen is a key component of most synthetic fertilizers. It is made by combining the nitrogen in the air with hydrogen in methane to produce ammonia (NH3). The ammonia is then used to create other forms of nitrogen including ammonium nitrate and urea (ammonia + CO2 ). Natural gas is used to provide the methane and a heat source for the process.
https://context.capp.ca › articles › 2020 › pirl-fertilizers
Petroleum in Real Life: Food, Fertilizer and Fuel - CAPP
During the process, 80% of the gas is used as feedŽstock for fertilizer, while the remaining 20% is used for heat and electricity production. The two main end products, ammonium nitrate and urea, are then mixed with other ingredients—mainly phosphorus and potassium—to manufacture a range of synthetic fertilizers for use on farms.
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