Even externally, in a quantitative chemical analysis as it were, the relationship between the oxygen–nitrogen connection in the air, and the limestone-hydrogen connection in the organic processes, might well be revealed. The fact is that under the influence of hydrogen, limestone and potash are constantly being transmuted into something very little nitrogen, and at length into actual nitrogen. And the nitrogen which is formed in this way is of the greatest benefit to plant-growth. We must enable it to be thus engendered by methods such as I have here described. (Steiner 2007:47)
STEINER, Rudolf. 2007. The Agriculture Course. (Trans.: George Adams) Shrewsbury: Wilding & Son Ltd.