Abstract
WE have already noticed the earlier field experiments made by this Association. The most prominent fact which they believe they have established is the efficacy of mineral phosphates, when in fine powder, as a manure for turnips. Such phosphates have always been treated with sulphuric acid, and converted into superphosphate before being employed as manure; to employ them in fine powder without this previous treatment would of course be more economical, if they are in this state sufficiently effective.
Proceedings of the Aberdeenshire Agricultural Association,
1878.
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Our Book Shelf . Nature 20, 288–289 (1879). https://doi.org/10.1038/020288a0
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DOI: https://doi.org/10.1038/020288a0
