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What may apply within limits to phosphorus is wholly valid for the trace-elements namely, that they are playing their essential role while they are themselves about to assume ponderable form. It thus becomes clear how mistaken it is to attempt to cure deficiencies in plants by adding to the soil chemical substitutes for the trace-elements.
8 Instead of using the trace-elements in mineral form, it is still better to use parts of certain plants with a strong 'functional tendency', specially prepared. This is done in the so-called Bio-Dynamic method of farming and gardening, according to Rudolf Steiner's indications. Matter as Part of Nature's Alphabet
In this respect Tillandsia provides an instance 'worth a thousand, bearing all within itself. For what nature here unmistakably demonstrates serves as an eye-opener to a universal fact of the plant kingdom and of nature in general. The problem of the so-called trace-elements may serve as an illustration of this.
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