Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 12
... surface of the leaf . Q. Do the leaves suck in this carbonic acid at all times ? A. No , only during the day time . During the night they give off a quantity of carbonic acid . Q. What does carbonic acid consist of ? A. Carbonic acid ...
... surface of the leaf . Q. Do the leaves suck in this carbonic acid at all times ? A. No , only during the day time . During the night they give off a quantity of carbonic acid . Q. What does carbonic acid consist of ? A. Carbonic acid ...
Página 20
... surface , such soils are often wet beneath , and would pay well for draining . The teacher may illustrate this , by referring his pupils to what they may see on the sea beach , or on the banks of a river , where the surface of the sand ...
... surface , such soils are often wet beneath , and would pay well for draining . The teacher may illustrate this , by referring his pupils to what they may see on the sea beach , or on the banks of a river , where the surface of the sand ...
Página 22
... surface soil , -subsoil ploughing , which only stirs and loosens the subsoil , —and trench ploughing or trench- ing , which brings the subsoil to the surface . Q. Would the land after this treatment also give greater crops of corn ? A ...
... surface soil , -subsoil ploughing , which only stirs and loosens the subsoil , —and trench ploughing or trench- ing , which brings the subsoil to the surface . Q. Would the land after this treatment also give greater crops of corn ? A ...
Página 29
... surface that the roots of the young corn could feed upon the decaying grass . Q. Are any other plants ploughed in green for the purpose of manuring the soil ? A. Yes , clover , buck - wheat , rape CHEMISTRY AND GEOLOGY . 29.
... surface that the roots of the young corn could feed upon the decaying grass . Q. Are any other plants ploughed in green for the purpose of manuring the soil ? A. Yes , clover , buck - wheat , rape CHEMISTRY AND GEOLOGY . 29.
Página 45
... surface . This experiment may be exhibited for the pur- pose of showing two things ; first , that carbonic acid ex- ists in the air ; and , second , that quicklime absorbs it . Lime - water is made by pouring water upon quicklime in a ...
... surface . This experiment may be exhibited for the pur- pose of showing two things ; first , that carbonic acid ex- ists in the air ; and , second , that quicklime absorbs it . Lime - water is made by pouring water upon quicklime in a ...
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...