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Organic Soil Conditioning
The modern chemical fertilizer (N-P-K) theory originated in the now famous lectures that Justis von Liebig delivered before the British Association for the Advancement of Science. He argued that "the primary source whence man and animals derive the means of their growth and support is the vegetable kingdom. Plants, on the other hand, find new nutritive materials only in inorganic substances." Simple logic then would hold that one could analyze the produce of an acre and "return the nutrients" removed for a maintenance fertility program or add a little more and have a "build up" program.