"Ammonia is the starting compound for making all synthetic nitrogenous fertilizers. "Every crop of high-yielding wheat and rice, as well as of many vegetables, requires more than 100 (sometimes as much as 200) kilograms of nitrogen per hectare, and **these high needs make the synthesis of nitrogenous fertilizers the most important indirect energy input in modern farming**." ([Location 1122](https://readwise.io/to_kindle?action=open&asin=B08SGC3TD3&location=1122)) --- **Tags** -- [[quotes]], [[nitrogenous-fertilisers]], [[farming]], [[fertilisers]], [[ammonia]] **Source** -- [[202412030828 - B - How the World Really Works]]