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Principles and Practice of Agricultural Analysis, Vol. 2

Principles and Practice of Agricultural Analysis, Vol. 2

33404528
1137.5 руб.
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Описание
Excerpt from Principles and Practice of Agricultural Analysis, Vol. 2: A Manual for the Estimation of Soils, Fertilizers, and Agricultural Products; For the Use of Analysts, Teachers, and Students of Agricultural Chemistry

1. Introduction. - In the first volume the principal plant foods occurring in soils have been named and the methods of estimating them described. As fertilizers are classed those materials which are added to soils to supply supposed deficiencies in plant foods, or to render more available the stores already present. There is little difference between the terms fertilizer and manure. In common language the former is applied to goods prepared for the farmer by the manufacturer or mixer, while the latter is applied to the stores accumulated about the stables or made elsewhere on the farm. Thus it is common to speak of a barn-yard or stall manure and of a commercial fertilizer.

One of the objects of the analysis of soils, as described in the first volume of this work, is to determine the character of the fertilizer which should be added to a field in order to secure its maximum fertility.

One purpose of the present part is to determine the fitness of offered fertilizing material to supply the deficiencies which may be revealed by a proper study of the needs of the soil.

2. Natural Fertilizers. - In the succession of geologic epochs which has marked the natural history of the earth there have been brought together in deposits of greater or less magnitude the stores of plant food unused by growing crops or which may once have been part of vegetable and animal organisms. Some of these deposits have been mentioned in the first volume, paragraphs 11, 12, and 18.

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