This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ... by crops is a constant source of loss of fertility to agricultural soils. In a state of nature the loss in this way is comparatively small, as the native vegetation falls on the ground, and in the process of decomposition the ash is almost entirely returned, while there is a large gain of organic ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ... by crops is a constant source of loss of fertility to agricultural soils. In a state of nature the loss in this way is comparatively small, as the native vegetation falls on the ground, and in the process of decomposition the ash is almost entirely returned, while there is a large gain of organic matter and often an increase in nitrogen as well. Under natural conditions the soil usually increases in fertility; for, while there is some loss through drainage and other sources, this is more than counterbalanced by the action of the natural agencies of disintegration and decomposition, while the fixation of atmospheric nitrogen affords a constant, though small, supply of that important soil ingredient. When land is placed under cultivation a very different condition is presented. Crops are removed and only partially returned at best to the soil as manure and crop residue. A certain proportion of the soil nutrients are, therefore, permanently withdrawn. The point of vital importance, however, is that only a part of the total supply of soil constituents will ever become available, the portion withdrawn each year by cropping being a more serious consideration than is generally supposed. The following table, computed by Warington,1 shows the quantities of nitrogen, potash, phosphoric acid, lime and sulfur trioxide2 removed from an acre of soil by some of the common crops. The entire harvested crop is included. 'Warington, R., Chemistry of the Farm; pp. 64-65, London, 1894. From Hart, E. B., and Peterson, W. H., Sulphur Requirements of Farm Crops in Eelation to the Soil and Air Supply; Wis. Agr. Exp. Sta., Ees. Bul. 14, 1911. Before the question of possible soil exhaustion can be discussed adequately, the losses of nutrients in the drainage water...
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Add this copy of The Nature and Properties of Soils; a College Text of to cart. $416.18, like new condition, Sold by Phatpocket Limited rated 4.0 out of 5 stars, ships from Waltham Abbey, ESSEX, UNITED KINGDOM, published 2012 by Rarebooksclub.com.
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