First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 3
... animals that are useful to man . A real knowledge of farming neces- sitates a knowledge of the principles upon which the art of agriculture is founded ; for an understanding of these principles is essential to an intelligent and ...
... animals that are useful to man . A real knowledge of farming neces- sitates a knowledge of the principles upon which the art of agriculture is founded ; for an understanding of these principles is essential to an intelligent and ...
Página 5
... animals or animal products . Even in the latter case the feeding crops that can be grown upon the farm determine its earning power , for the sale of ... animals and animal products is merely one way of marketing the crop. INTRODUCTORY 5.
... animals or animal products . Even in the latter case the feeding crops that can be grown upon the farm determine its earning power , for the sale of ... animals and animal products is merely one way of marketing the crop. INTRODUCTORY 5.
Página 6
Alfred Vivian. power , for the sale of animal products is simply an indirect method of marketing the crops . The profit ... animals , the average farmer has only very vague and often false notions on the subject of plant food and plant ...
Alfred Vivian. power , for the sale of animal products is simply an indirect method of marketing the crops . The profit ... animals , the average farmer has only very vague and often false notions on the subject of plant food and plant ...
Página 16
... animals do , for all cells must have a supply of oxygen in order to live . The oxygen of the air combines with the materials in the cells one of the results being the production of heat , just as the oxidation taking place in the animal ...
... animals do , for all cells must have a supply of oxygen in order to live . The oxygen of the air combines with the materials in the cells one of the results being the production of heat , just as the oxidation taking place in the animal ...
Página 19
... Animals live directly or indirectly on plants , and breathe out the carbon they consume in the form of carbonic acid gas . It will thus be seen that the carbon is continually in circulation , being combined by the plant into complex ...
... Animals live directly or indirectly on plants , and breathe out the carbon they consume in the form of carbonic acid gas . It will thus be seen that the carbon is continually in circulation , being combined by the plant into complex ...
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Términos y frases comunes
acid and potash acre agricultural ammonia amount of nitrogen amount of plant animals applied average bacteria barn barnyard manure bedding carbonic acid clay clover commercial fertilizers complete fertilizers composition compounds condition corn crop decay deep stall denitrification drainage dry matter elements of plant Experiment Station fact farm farmer feeding fertilizing constituents fertilizing materials fertilizing value field grain green manuring ground grown hot fermentation humus important inches increase ingredients kainite land leaching legumes leguminous lime liquid excrement loss of nitrogen lysimeters manure produced materials ments method mineral matter mixed moisture necessary nitrate of soda nitrification nitrifying bacteria nitro nitrogen nure obtained organic matter oxygen phoric acid phos phosphate phosphoric acid plant food plant growth plots plowed pounds practically present rains ration removed rock roots rotation shown soil soil contains soluble substances sufficient sulphate superphosphate supply surface tillage tion urine wheat yield
Pasajes populares
Página 225 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and the economical use of this expensive element, nitrogen, is dependent to a large degree upon the abundance of the mineral elements in the soil. It is, therefore, advocated that for all crops and for all soils that are in a good state of cultivation, a reasonable excess of phosphoric acid and potash...
Página 1 - ... woods ; All silent is the earth and sky, Except with his own lonely moods The blackbird holds a colloquy. Over the broad hill creeps a beam, Like hope that gilds a good man's brow, And now ascends the nostril-stream Of stalwart horses come to plough.
Página 245 - One will seek to know what the different forms of plant-food are, what they do, from what sources they can be obtained, and how he can use them to best advantage. He will become to some extent an investigator, and will, of necessity, take a deeper interest in his work.