Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 sider |
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Side 17
... fertile soils it does not 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 proportion of organic matter ? A. Not in our climate . A rich soil generally ...
... fertile soils it does not 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 proportion of organic matter ? A. Not in our climate . A rich soil generally ...
Side 23
... fertile or productive soils do . Q. Why must a fertile soil contain them all ? A. Because plants require them all for their healthy growth . Q. Do plants require them all in equal proportion ? A. No. Plants must have a certain small ...
... fertile or productive soils do . Q. Why must a fertile soil contain them all ? A. Because plants require them all for their healthy growth . Q. Do plants require them all in equal proportion ? A. No. Plants must have a certain small ...
Side 25
... grow good crops of any kind whatever . It would be naturally barren . Q. Are any soils known to exist which are natu- rally barren or naturally fertile ? A. Yes ; some large tracts of country which have CHEMISTRY AND GEOLOGY . 25.
... grow good crops of any kind whatever . It would be naturally barren . Q. Are any soils known to exist which are natu- rally barren or naturally fertile ? A. Yes ; some large tracts of country which have CHEMISTRY AND GEOLOGY . 25.
Side 26
... Fertile , Fertile , without with Barren . Manure . Manure . Organic Matter , 97 50 40 Silica ( in the sand and clay ) , 648 833 778 Alumina ( in the clay ) , 57 51 91 Lime , 59 18 4 Magnesia , 8 8 1 Oxide of iron , Oxide of manganese ...
... Fertile , Fertile , without with Barren . Manure . Manure . Organic Matter , 97 50 40 Silica ( in the sand and clay ) , 648 833 778 Alumina ( in the clay ) , 57 51 91 Lime , 59 18 4 Magnesia , 8 8 1 Oxide of iron , Oxide of manganese ...
Side 27
... fertile , be ren- dered barren by continued cropping ? A. Yes , if the same kind of cropping be carried on for a long time , the land will gradually become less and less productive . Q. How is this explained ? A. Every crop takes away ...
... fertile , be ren- dered barren by continued cropping ? A. Yes , if the same kind of cropping be carried on for a long time , the land will gradually become less and less productive . Q. How is this explained ? A. Every crop takes away ...
Vanlige uttrykk og setninger
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
Populære avsnitt
Side 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...