Elements of Agricultural Chemistry and GeologyW. Blackwood, 1852 - 410 páginas |
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Página 15
... large proportion of water ; but the dry matter of their bodies , as a whole , is distinguished from that of plants , by containing a larger proportion of nitrogen , sulphur , and phosphorus . Some parts of the bodies of animals are ...
... large proportion of water ; but the dry matter of their bodies , as a whole , is distinguished from that of plants , by containing a larger proportion of nitrogen , sulphur , and phosphorus . Some parts of the bodies of animals are ...
Página 41
... larger supply of food is afforded when the growth is most rapid , or when the short life of the annual plant demands much nourishment within a limited time . The yellow and red leaves and parts of plants give off no oxygen , ( Senebier ...
... larger supply of food is afforded when the growth is most rapid , or when the short life of the annual plant demands much nourishment within a limited time . The yellow and red leaves and parts of plants give off no oxygen , ( Senebier ...
Página 55
... larger proportion than when the seed is matured . In the pea , when beginning to form in the shell , it constitutes 48 per cent of the whole weight , ( Payen , ) while in the ripe pea it does not exceed one - half the quantity . When ...
... larger proportion than when the seed is matured . In the pea , when beginning to form in the shell , it constitutes 48 per cent of the whole weight , ( Payen , ) while in the ripe pea it does not exceed one - half the quantity . When ...
Página 57
... larger plants are really pro- duced from the substances contained in the sap . If , then , those substances from which their growing parts are thus known to be built up can be conveyed directly into the circulation of our cultivated ...
... larger plants are really pro- duced from the substances contained in the sap . If , then , those substances from which their growing parts are thus known to be built up can be conveyed directly into the circulation of our cultivated ...
Página 65
... larger propor- tion of inorganic matter than the wood . Thus , 1000 lb. of the dry wood and leaves of the following ... large portion of the soluble inorganic substances which had been drawn from it by their roots during the season of ...
... larger propor- tion of inorganic matter than the wood . Thus , 1000 lb. of the dry wood and leaves of the following ... large portion of the soluble inorganic substances which had been drawn from it by their roots during the season of ...
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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 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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