Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 9
... that they may live and grow . Q. Where do plants obtain their food ? A. They obtain it partly from the air and partly from the soil . Q. How do they take in their food ? A. They take it in by their leaves from the CHEMISTRY AND GEOLOGY . 9.
... that they may live and grow . Q. Where do plants obtain their food ? A. They obtain it partly from the air and partly from the soil . Q. How do they take in their food ? A. They take it in by their leaves from the CHEMISTRY AND GEOLOGY . 9.
Página 10
James Finlay Weir Johnston. A. They take it in by their leaves from the air , and by their roots from the soil . Q. Do plants require two distinct kinds of food ? A. Yes , they require organic food to support their organic part , and ...
James Finlay Weir Johnston. A. They take it in by their leaves from the air , and by their roots from the soil . Q. Do plants require two distinct kinds of food ? A. Yes , they require organic food to support their organic part , and ...
Página 11
... of this gas from the air , which contains so little ? A. They spread out their broad thin leaves in great numbers through the air , and thus are able to suck in the carbonic acid from a large quantity of air. CHEMISTRY AND GEOLOGY . 11 ...
... of this gas from the air , which contains so little ? A. They spread out their broad thin leaves in great numbers through the air , and thus are able to suck in the carbonic acid from a large quantity of air. CHEMISTRY AND GEOLOGY . 11 ...
Página 12
... leaves ? A. No , it retains only the carbon , giving off the oxygen again into the air . Q. How do you show that the leaves give off this oxygen gas ? A. By putting a few green leaves under a tumbler or gas - receiver full of water ...
... leaves ? A. No , it retains only the carbon , giving off the oxygen again into the air . Q. How do you show that the leaves give off this oxygen gas ? A. By putting a few green leaves under a tumbler or gas - receiver full of water ...
Página 13
... leaves of plants drink in anything else from the atmosphere ? A. Yes , they drink in watery vapour . Q. What purpose does this vapour serve ? Fig . 10 . A. It serves in part to moisten the leaves and stems , and partly to form the ...
... leaves of plants drink in anything else from the atmosphere ? A. Yes , they drink in watery vapour . Q. What purpose does this vapour serve ? Fig . 10 . A. It serves in part to moisten the leaves and stems , and partly to form the ...
Palavras e frases frequentes
AGRICULTURAL CHEMISTRY ammonia animal require applied bone-earth bones burns called carbon and water carbonic acid gas CHEMISTRY AND GEOLOGY Chlorine clover common salt compost consist of carbon contain cow-dung crops cwts draining dung earth EDINBURGH employed fall to powder farm-yard manure farmer fattening fermentation fertile give gluten grass lands grow guano gypsum hydrogen inorganic kind of air large quantity leaves LECTURES ON AGRICULTURAL light lands lighted taper limestone liquid magnesia marl mixed nitrogen oats obtain oil of vitriol organic food organic matter oxide of iron oxygen gas phosphate of lime phosphoric acid plants require potash potatoes produced profit proportion pupils quicklime roots sea-weed shell sand Silica slaked smell soda soil consists sour starch straw subsoil substances sulphuric acid supply taste teacher may exhibit teacher may illustrate teacher will show turnip usually vegetable waste wheat white fumes wood woody fibre
Passagens conhecidas
Página 17 - Q. Whence is the organic part of the soil derived? A. It is derived from the roots and stems of decayed plants, and from the dung and remains of animals and insects of various kinds. Q. Does this organic part form a large proportion of the soil ? A. Of peaty soils it forms sometimes three-fourths of the whole weight; but of rich and fertile soils it does not usually form more than from a twentieth to a tenth of the whole weight. Q. Can a soil bear good crops which does not contain a considerable...