Translations:Benutzer:Arian/Klett-Mini-Test/1085/en

In repeated waves during the nineteenth and twentieth centuries, attempts were made to give rock dusts greater attention. These efforts found themselves in hopeless competition with the rapidly spreading so-called "artificial fertilizer economy" — the application of essentially nitrogen, phosphorus and potassium in highly concentrated form. Quick results were hoped for; they failed to materialise — which could hardly have been otherwise. The application of rock dusts is, precisely, a matter of long-term amelioration, of a gradual rejuvenation of base-deficient soils. The efficacy of these dusts accelerates with their degree of fineness, and is still more effective in combination with organic materials such as farmyard manure, liquid manure and composts.