Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
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Página 22
... marl when it is required . The teacher will here explain to his pupils the dif- ference between common ploughing , which merely turns over the surface soil , -subsoil ploughing , which only stirs and loosens the subsoil , —and trench ...
... marl when it is required . The teacher will here explain to his pupils the dif- ference between common ploughing , which merely turns over the surface soil , -subsoil ploughing , which only stirs and loosens the subsoil , —and trench ...
Página 30
... marl if they were to be had , and turn it over once or twice before using it . Q. Are there any common green vegetables that are ploughed in with advantage ? A. Yes , potatoe - tops dug in , or turnip - tops , when the roots are lifted ...
... marl if they were to be had , and turn it over once or twice before using it . Q. Are there any common green vegetables that are ploughed in with advantage ? A. Yes , potatoe - tops dug in , or turnip - tops , when the roots are lifted ...
Página 32
... marl , makes a most enrich- ing compost . Q. In what form are bones employed as a ma- nure ? A. Bones are crushed in mills , and then sifted into the various sizes of inch bones , half - inch bones , and dust . Q. In which of these ...
... marl , makes a most enrich- ing compost . Q. In what form are bones employed as a ma- nure ? A. Bones are crushed in mills , and then sifted into the various sizes of inch bones , half - inch bones , and dust . Q. In which of these ...
Página 39
... the herring and pilchard and the heads of the cod are extensively employed as a manure . Q. How is this refuse best used ? A. The best way is to make it into a compost with earth and a quantity of marl , if any of CHEMISTRY AND GEOLOGY .
... the herring and pilchard and the heads of the cod are extensively employed as a manure . Q. How is this refuse best used ? A. The best way is to make it into a compost with earth and a quantity of marl , if any of CHEMISTRY AND GEOLOGY .
Página 40
James Finlay Weir Johnston. earth and a quantity of marl , if any of the latter is at hand , and to turn it over once or twice before using . Q. Name the most important mineral manures . A. The most important mineral manures are , ni ...
James Finlay Weir Johnston. earth and a quantity of marl , if any of the latter is at hand , and to turn it over once or twice before using . Q. Name the most important mineral manures . A. The most important mineral manures are , ni ...
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...