Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 9
... ORGANIC FOOD OF PLANTS . Q. Do plants require food as animals do ? A. Yes , all plants require constant supplies of food in order that they may live and grow . Q. Where do plants obtain their food ? A. They obtain it partly from the air ...
... ORGANIC FOOD OF PLANTS . Q. Do plants require food as animals do ? A. Yes , all plants require constant supplies of food in order that they may live and grow . Q. Where do plants obtain their food ? A. They obtain it partly from the air ...
Página 10
... food ? A. Yes , they require organic food to support their organic part , and inorganic food to support their in- organic part . Q. Whence do they obtain their organic food ? A. They obtain their organic food partly from the air and ...
... food ? A. Yes , they require organic food to support their organic part , and inorganic food to support their in- organic part . Q. Whence do they obtain their organic food ? A. They obtain their organic food partly from the air and ...
Página 18
... organic food which plants draw from the soil through their roots . Q. Do plants draw much of their organic food from the soil ? A. The quantity they draw from the soil varies with the kind of plant , with the kind of soil , and with the ...
... organic food which plants draw from the soil through their roots . Q. Do plants draw much of their organic food from the soil ? A. The quantity they draw from the soil varies with the kind of plant , with the kind of soil , and with 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...