First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 34
... ration soda ; b full ration potash One element of plant food cannot take the place of another in promoting plant growth . The pile on the right shows spinach grown with complete fertilizer . The pile on the left received the same ...
... ration soda ; b full ration potash One element of plant food cannot take the place of another in promoting plant growth . The pile on the right shows spinach grown with complete fertilizer . The pile on the left received the same ...
Página 117
... Ration.— The total value of the manure produced by a given number of animals is dependent on the quality and quantity of the feeding stuff used in the ration . That the different materials used for feeding vary greatly in their ...
... Ration.— The total value of the manure produced by a given number of animals is dependent on the quality and quantity of the feeding stuff used in the ration . That the different materials used for feeding vary greatly in their ...
Página 118
... ration . If now the total dry matter in the materials fed is determined , and likewise that voided in the excrement , it will be found that the dry matter in the excrement is just about one - half the amount that was present in the food ...
... ration . If now the total dry matter in the materials fed is determined , and likewise that voided in the excrement , it will be found that the dry matter in the excrement is just about one - half the amount that was present in the food ...
Página 119
... ration . For the first year of their existence they use in body growth an average of about one - fifth of the nitrogen , phos- phoric acid and potash that was present in the food , and the amount gradually diminishes until practically ...
... ration . For the first year of their existence they use in body growth an average of about one - fifth of the nitrogen , phos- phoric acid and potash that was present in the food , and the amount gradually diminishes until practically ...
Página 120
... ration fed is recovered in the excreta , and that the age of the animal is the principal factor in determining the amount that is removed . The fertility removed in the milk when it is sold from the farm is also of considera- ble ...
... ration fed is recovered in the excreta , and that the age of the animal is the principal factor in determining the amount that is removed . The fertility removed in the milk when it is sold from the farm is also of considera- ble ...
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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.