German farmers simply did not have enough fertiliser.
For fertilisers, you need nitrogen, and for nitrogen you need saltpetre ( nitre ), and not enough of that was available.
Georg Steuler dealt with this problem.
www.steuler.deEs fehlte der deutschen Landwirtschaft an Dünger.
Für Dünger braucht man Stickstoff, und für Stickstoff benötigt man Salpeter. Und der stand nicht in ausreichender Menge zur Verfügung.
Georg Steuler nahm sich dieses Problems an.
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