Catechism of Agricultural Chemistry and GeologyW. Blackwood, 1844 - 48 páginas |
No interior do livro
Resultados 1-5 de 16
Página 18
... manure or of peat compost are given to it . Q. What purpose does this organic matter serve in the soil ? A. It supplies the organic food which plants draw from the soil through their roots . Q. Do plants draw much of their organic food ...
... manure or of peat compost are given to it . Q. What purpose does this organic matter serve in the soil ? A. It supplies the organic food which plants draw from the soil through their roots . Q. Do plants draw much of their organic food ...
Página 26
... 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 , Potash , Soda , chiefly as common salt ...
... 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 , Potash , Soda , chiefly as common salt ...
Página 27
... manure . The third was hopelessly bar- ren , -- it was in want of many substances which ordinary manuring could not supply . Q. May a soil be barren though it contains all the substances which plants require ? A. Yes , if it contain a ...
... manure . The third was hopelessly bar- ren , -- it was in want of many substances which ordinary manuring could not supply . Q. May a soil be barren though it contains all the substances which plants require ? A. Yes , if it contain a ...
Página 29
... manure his soil . VI.- -OF THE MANURING OF THE SOIL . Q. What is a manure ? A. Any thing that furnishes food to plants may be called a manure . Q. How many principal kinds of manure are there ? A. There are three principal kinds ...
... manure his soil . VI.- -OF THE MANURING OF THE SOIL . Q. What is a manure ? A. Any thing that furnishes food to plants may be called a manure . Q. How many principal kinds of manure are there ? A. There are three principal kinds ...
Página 30
... manure ? A. Yes , wherever sea - weed can be obtained in large quantity , it is found to enrich the soil very much . Q. How is it employed ? A. It is either spread over the land and allowed to rot and sink in , or it is made into a ...
... manure ? A. Yes , wherever sea - weed can be obtained in large quantity , it is found to enrich the soil very much . Q. How is it employed ? A. It is either spread over the land and allowed to rot and sink in , or it is made into 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...