Principles of Agricultural Chemistry: With Special Reference to the Late Researches Made in EnglandJohn Wiley, 1855 - 105 páginas |
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Términos y frases comunes
acid and ammonia acre action agricultural chemistry agriculturist alkalies ammo ammoniacal salts annually ashes atmospheric food available mineral constituents average crop barren carbonic acid chemist coprolites crop of turnips cultivation deficient dissolved doctrine effect efficacy equal excess of produce exhaustion facts farm-yard manure farmer food of plants given grain and straw growth guano gypsum higher produce humus increase of produce increase the produce indispensable ingredients LAWES'S EXPERIMENTS Liebig lot manured magnesia manured with ammoniacal means mineral constituents present mineral food mineral manure mineral substances moniacal natural laws necessary neral nitric acid nure nutrition obtained opinion phate phos phosphate of lime phosphoric acid proportion quantity removed restoration scientific principles silicate of potash so-called Mineral Theory soil contains soluble source of nitrogen stable manure sulphuric acid superphosphate supply of ammonia tion truth unmanured land unmanured lot vegetable wheat whole yielded
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Página 89 - the crops on a field diminish or increase in exact proportion to the diminution or increase of the mineral substances conveyed to it in manure...
Página 28 - by the deficiency or absence of one necessary constituent, all the others being present, the soil is rendered barren for all those crops to the life of which that one constituent is indispensable ". These and other amplifications in the third edition, 1843, gave rise to much controversy.
Página 28 - The deficiency of one ingredient renders those present ineffectual, or diminishes their effect. 41. If the absent or deficient substance be added to the soil, or, if present, but insoluble, be rendered soluble, the other constituents are thereby rendered efficient. By the deficiency or absence of one necessary constituent, all the others being present, the soil is rendered barren for all those crops to the life of which that one constituent is indispensable. The soil yields rich crops if that substance...
Página 96 - ... slaughtered animals. It altogether depends upon us to keep our fields in a constant state of composition and fertility by the careful collection of these substances. We are able to calculate how much of the ingredients of the soil are removed by a sheep, by an ox, or in the milk of a cow, or how much...
Página 72 - As we have in substance frequently said, it is but a truism to assert that the growing plant must have within its reach a sufficiency of the mineral constituents of which it is to be built up.
Página 26 - On the unequal quantity and quality (solubility, &c.) of the mineral constituents, and on the unequal proportions in which they are required for the development of the different cultivated crops, depends the rotation of crops, and the varieties of rotation employed indifferent localities.
Página 94 - It never occurred to me to assert that the land of Great Britain was deficient in the substances which are found together in the ashes of the crops raised on it,
Página 80 - ... in the soil." But now for the other side of the question. Besides stating, as already pointed out (and in spite of his lengthened argument and summing up to, the contrary), that the increase we obtained by manuring with ammoniacal salts alone, was only what theory plainly predicted, he says...
Página 30 - ... and ammonia, rich crops, without in any way restoring the mineral substances removed in these crops. The duration of this fertility then depends on the supply ; that is, the quantity and quality of the mineral constituents existing in the soil. The continued use of these manures produces, sooner or later, an exhaustion of the soil. 50. If, after a time, the soil is to recover its original fertility, the mineral substances extracted from it in a series of years must be again restored to it. If...
Página 29 - With equal supplies of the atmospheric conditions of the growth of plants, the crops are in direct proportion to the amount of mineral constituents supplied in the manure. 45. With equal telluric conditions, the crops are in proportion to the amount of atmospheric constituents supplied by the air and the soil (including manure). If, to the available mineral constituents in the soil, ammonia and carbonic acid be added in the manure, the fertility of the soil is exalted. The union of the telluric and...