Read online or download a free book: Soil Alkali: Its Origin, Nature, And Treatment
Publisher: RareBooksClub.com (14 May 2012)
By: Franklin Stewart Harris (Author)
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...from 2 to 18 inches with an average of 3 to 6 inches. A good example is described by Gardner and Stewart (8). A number of explanations of the genesis of hardpans have been given. Hilgard (13) has the following to say about the cause of hardpan: 'The recognition of the cause of hardpan is of considerable importance to the farmer because of the influence of the nature of the cement and the causes of its formation upon the possibility and methods of its destruction, for the improvement of the land. 'It may be said in general that inasmuch as the cause of the formation of hardpan is a stoppage of the water in its downward penetration, the reestablishment of that penetration will tend to prevent additional induration: moreover, experience proves that whenever this is accomplished even locally, as around a fruit tree in an orchard, the hardpan gradually softens and disappears before the frequent changes in moisture conditions and the attack of roots. The use of dynamite for this purpose in California has already been referred to: it seems to be the only resort when the hardpan lies at a considerable depth. When it is within reach of the plow, it may be turned up on the surface by the aid of a subsoiler and will then gradually disintegrate under the influence of air, rain, and sun. But when the hardpan is of the nature of moorbedpan, containing much humic acid and perhaps underlaid by bog-iron ore, the use of lime on the land is indicated, and will in the course of time destroy the hardpan layer. This is the more desirable as in such cases the surface soil is usually completely leached of its lime content, and is consequently extremely unthrifty.' Cameron (5) gives the following explanation of the origin of hardpans: 'The application of the pre...
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