First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 39
... remains in the leachings . Second , by surface washing . In hilly countries this may be a very important factor . As the soil is re- moved bodily from the surface of the field , it follows that the loss in this case falls on all the ...
... remains in the leachings . Second , by surface washing . In hilly countries this may be a very important factor . As the soil is re- moved bodily from the surface of the field , it follows that the loss in this case falls on all the ...
Página 56
... remains of the plants which have grown on it , a humus or peaty soil is formed . Sedentary and Transported Soils . - Soils which have been. Lakes , ponds and swamps are gradually being filled by the movement of the soil from higher to ...
... remains of the plants which have grown on it , a humus or peaty soil is formed . Sedentary and Transported Soils . - Soils which have been. Lakes , ponds and swamps are gradually being filled by the movement of the soil from higher to ...
Página 67
... remains only to say that tillage would pay for itself if it did no more than hasten nitrification . Thorough aeration of the soil prevents the action of the denitrifying bacteria , as these bacteria thrive . best in a soil devoid of ...
... remains only to say that tillage would pay for itself if it did no more than hasten nitrification . Thorough aeration of the soil prevents the action of the denitrifying bacteria , as these bacteria thrive . best in a soil devoid of ...
Página 133
... remains a handsome profit as a result of the ap- plication . A Profitable Calculation . - The easiest way for the farmer to calculate the value of the manure produced per year on his farm is to add together the amounts of fertilizing ...
... remains a handsome profit as a result of the ap- plication . A Profitable Calculation . - The easiest way for the farmer to calculate the value of the manure produced per year on his farm is to add together the amounts of fertilizing ...
Página 137
... remains that few even approximate these results with their present practices . Barnyard manure is a perisha- ble material , and must be handled with care and intel- ligence to obtain its maximum value . As manure is handled on the ...
... remains that few even approximate these results with their present practices . Barnyard manure is a perisha- ble material , and must be handled with care and intel- ligence to obtain its maximum value . As manure is handled on the ...
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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.