Im my Chemistry diploma exam I was asked about this thematic complex. There is another reason the German Kaiserreich promoted the invention of the Haber-Bosch process. There were two other industrial processes important to this workflow: coal liquefaction yielding mainly toluene and the Oswald process burning the ammonia which came out of the Haber-Bosch process to nitrogen oxides. These could be dissolved in water to yield nitric acid. Nitric acid and toluene yield trinitrotoluene also known as TNT. So in addition to feeding the world it was a war relevant process since the allied forces impeded access to Chilean salpeter.