While the nutrition of mammals requires organic chemicals, the nutrition of plants requires inorganic chemicals, the exception, in both cases, being iron. This is why artificial fertilisers are so important in agriculture.
Organic farmers ban the use of artificial fertilisers on the grounds that they are synthetic chemicals but, in the long view, this has to be a mistake. Humanity as a whole cannot feed itself without artificial fertilisers and, so long as organic farmers forbid them, the total organic farming will be restricted by the supply of organic manures, which are very limited.
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