Elements of Agricultural Chemistry and GeologyW. Blackwood, 1852 - 410 páginas |
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Página x
... matter in soils . - Examination and classification of soils . - Determination of the per - centage of sand , clay , vegetable matter , and lime . - Diversities of soils and subsoils . CHAPTER VI . Direct relations of geology to ...
... matter in soils . - Examination and classification of soils . - Determination of the per - centage of sand , clay , vegetable matter , and lime . - Diversities of soils and subsoils . CHAPTER VI . Direct relations of geology to ...
Página 7
... matter , of organic origin . If we heat a portion of such a soil to redness in the open air , as in the annexed , ( fig . 1 , ) Fig . 1 . this organic matter will burn away , leaving the inorganic or mineral mat- ter behind . By this ...
... matter , of organic origin . If we heat a portion of such a soil to redness in the open air , as in the annexed , ( fig . 1 , ) Fig . 1 . this organic matter will burn away , leaving the inorganic or mineral mat- ter behind . By this ...
Página 8
... matter the plant much organic and little mineral — the animal , in its soft parts , little , in its hard or solid parts , much mineral matter . - SECTION III . - OF SIMPLE OR ELEMENTARY AND COMPOUND BODIES . The various kinds of organic ...
... matter the plant much organic and little mineral — the animal , in its soft parts , little , in its hard or solid parts , much mineral matter . - SECTION III . - OF SIMPLE OR ELEMENTARY AND COMPOUND BODIES . The various kinds of organic ...
Página 21
... matter , ( called humus by some writers , ) and such matter is always added to it when it is manured from the farm - yard or the com- post heap . During the decay of this vegetable matter , carbonic acid , as above stated , is given off ...
... matter , ( called humus by some writers , ) and such matter is always added to it when it is manured from the farm - yard or the com- post heap . During the decay of this vegetable matter , carbonic acid , as above stated , is given off ...
Página 24
... matter . One of the ways in which lime acts beneficially upon the soil is supposed to be by disposing these in- soluble matters to enter into new states of combination , in which they may become soluble , and thus capable of entering ...
... matter . One of the ways in which lime acts beneficially upon the soil is supposed to be by disposing these in- soluble matters to enter into new states of combination , in which they may become soluble , and thus capable of entering ...
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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
Passagens conhecidas
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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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