Sódio em Steiner (2007)

That on the one hand. On the other hand we find another kind of substance, which must occur everywhere throughout the Earth, albeit it is not so widespread as the silicious element. I mean the chalk or limestone substances and all that is akin to these — limestone, potash, sodium substances. Once more, if these were present to a less extent, we should have plants with very thin stems — plants, to a large extent, with twining stems; they would all become like creepers. The flowers would expand, it is true, but they would be useless: they would provide practically no nourishment. Plant-life in the form in which we see it to-day can only thrive in the equilibrium and co-operation of the two forces — or, to choose two typical substances, in the co-operation of the limestone and silicious substances respectively. (Steiner 2007:12)

STEINER, Rudolf. 2007. The Agriculture Course. (Trans.: George Adams) Shrewsbury: Wilding & Son Ltd.