Elements of Agricultural Chemistry and GeologyW. Blackwood, 1852 - 410 páginas |
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Página 6
... readily burned away and dissipated by heat in the open air ; inorganic substances are generally fixed and permanent in the fire . Now the crops which grow upon the land , as well as the soil in which they are rooted , contain a portion ...
... readily burned away and dissipated by heat in the open air ; inorganic substances are generally fixed and permanent in the fire . Now the crops which grow upon the land , as well as the soil in which they are rooted , contain a portion ...
Página 14
... readily recognised . Hydrogen extinguishes the taper , but itself takes fire ; nitrogen simply extinguishes it ; while in oxygen the taper burns rapidly and with extraordinary brilliancy . SECTION V. - PROPORTIONS OF THESE ELEMENTARY ...
... readily recognised . Hydrogen extinguishes the taper , but itself takes fire ; nitrogen simply extinguishes it ; while in oxygen the taper burns rapidly and with extraordinary brilliancy . SECTION V. - PROPORTIONS OF THESE ELEMENTARY ...
Página 22
... readily be extracted from the peat by means of potash , soda , or ammonia , in solutions of which they easily dissolve . Thus if the common soda of the shops be dissolved in water , and a portion of a rich vegetable soil , or a bit of ...
... readily be extracted from the peat by means of potash , soda , or ammonia , in solutions of which they easily dissolve . Thus if the common soda of the shops be dissolved in water , and a portion of a rich vegetable soil , or a bit of ...
Página 23
... readily , however , when they are combined with potash , soda , or ammonia . And as the latter substance especially is produced , and is always present in the soil , and as these acids attract it very strongly , there is good reason for ...
... readily , however , when they are combined with potash , soda , or ammonia . And as the latter substance especially is produced , and is always present in the soil , and as these acids attract it very strongly , there is good reason for ...
Página 27
... readily be resolved or decomposed artificially into these two gases . The same thing takes place naturally in the interior of the living plant . The roots and leaves absorb the water ; but if in any part of the plant hydro- gen be ...
... readily be resolved or decomposed artificially into these two gases . The same thing takes place naturally in the interior of the living plant . The roots and leaves absorb the water ; but if in any part of the plant hydro- gen be ...
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Outras edições - Ver tudo
Elements of Agricultural Chemistry and Geology James Finlay Weir Johnston Visualização integral - 1855 |
Palavras e frases frequentes
abound acre agricultural ammonia animal applied arable barley bones burned bushels carbonic acid cent chalk chemical chiefly clay composition consists contain crops decay dissolved districts drains dung effect farmer farmyard manure fermentation fertilising fertility fibre geology gluten grain grass green grow growth guano gypsum Hence improvement inorganic kind land leaves less limestone liquid magnesia milk mineral mixed mixture natural nearly nitrate nitrate of soda nitric acid nitrogen oats organic food organic matter oxide of iron oxygen pasture peat phosphate phosphate of lime phosphoric acid plants ploughing portion potash potato practical produce proportion protein compounds quantity rains readily rich rocks roots saline matter saline substances salt sand sandstone sandy SECTION seed silica soda soil solid soluble starch straw subsoil sugar sulphate sulphuric acid supply surface tain tion top-dressing turnip urine vegetable matter weight wheat yield
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Página 382 - We have thoroughly examined these volumes ; but to give a full notice of their varied and valuable contents would occupy a larger space than we can conveniently devote to their discussion ; we therefore, in general terms, commend them to the careful study of every young man who wishes to become a good practical farmer.— Times.
Página 377 - THE PLANTER'S GUIDE. By SIR HENRY STEUART. A New Edition, with the Author's last Additions and Corrections. 8vo, with Engravings, 21s. STABLE ECONOMY: A Treatise on the Management of Horses.
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Página 217 - Johnstone remarks (Ag. f' it fin., p. 170), the amount of nitrogen present in each of the organic manures affords one of the readiest and most simple tests by which their relative agricultural values, compared with those of vegetable matters and with each other, can be pretty nearly estimated. In reference to their relative quantities of nitrogen, therefore, they have been arranged in the following order, the number opposite to each representing the weight in Ibs. which is equivalent to or would...
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Página 41 - When a seed is committed to the earth, if the warmth and moisture are favorable it begins to sprout. It pushes a shoot upwards, it thrusts a root downwards ; but until the leaf expands and the root has fairly entered the soil, the young plant derives no nourishment other than water, either from the earth or from the air. It lives on the starch and gluten contained in the seed.
Página 73 - ... in vegetable matter, leave no more than 10 of clay when treated in this manner, it is called a sandy soil; if from 10 to 40, a sandy loam; if from 40 to 70, a loamy soil; if from 70 to 85, a clay loam ; from 85 to 95, a strong clay soil; and when no sand is separated at all by this process, it is a pure agricultural clay.
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