First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 115
... purchasing manures . For the farmer who * This valuation is based on 15 cents per pound for nitrogen , and 5 cents for phosphoric acid and potash . This represents in round numbers the market price of these elements in commercial ...
... purchasing manures . For the farmer who * This valuation is based on 15 cents per pound for nitrogen , and 5 cents for phosphoric acid and potash . This represents in round numbers the market price of these elements in commercial ...
Página 116
... the nitrogen , phosphoric acid and potash in the manure produced on his farm would cost if purchased in commercial fertilizers , granting • that the manure is so managed as to prevent loss 116 FIRST PRINCIPLES OF SOIL FERTILITY.
... the nitrogen , phosphoric acid and potash in the manure produced on his farm would cost if purchased in commercial fertilizers , granting • that the manure is so managed as to prevent loss 116 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 121
... purchased . Nitrogen is also used . by the animal body in much larger amounts than the other substances , and the difference in fertilizing value between the food and the excrement is largely due to the retention of nitrogen . It will ...
... purchased . Nitrogen is also used . by the animal body in much larger amounts than the other substances , and the difference in fertilizing value between the food and the excrement is largely due to the retention of nitrogen . It will ...
Página 132
... purchased in commercial fertilizers . How nearly the actual agricultural value of the manure will approach the trade value depends upon a number of conditions such as the crop to be fed , the physical condition and tilth of the soil ...
... purchased in commercial fertilizers . How nearly the actual agricultural value of the manure will approach the trade value depends upon a number of conditions such as the crop to be fed , the physical condition and tilth of the soil ...
Página 134
... purchasing feeding stuffs rich in the fertilizing constituents , feeding them to his animals and using the manure as a fertilizer . The most suc- cessful stockmen find it profitable to reinforce the feeds raised on the farm with one or ...
... purchasing feeding stuffs rich in the fertilizing constituents , feeding them to his animals and using the manure as a fertilizer . The most suc- cessful stockmen find it profitable to reinforce the feeds raised on the farm with one or ...
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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.