Publisher's Synopsis
Excerpt from Bulletin, 1908: Nos. 48-60
The use of manures as a means of increasing the growth of crops dates back to ancient times. At the time of the discovery of America, the North American Indians used dead fish as a manure for corn. The Peruvians have used guano since the beginning of their recorded history, and the Chinese have long recognized the value of all kinds of excrements as fertilizers. In the early part of the last century De Saussure established the existence of the mineral constituents of the soil in plants, and while he believed that they were essential to the life of plants, his contemporaries regarded them as nonessential, or at the best useful only as a kind of stimulant.
Justus Von Liebig, as a result of his investigations, published in 1843 a new edition of his notable work, Chemistry in its Application to Agriculture and Physiology, in which it may be said he laid the foundation of the celebrated mineral theory of agriculture.
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