First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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... reason some things have been omitted which might have been discussed with profit in a larger work . Only the more important facts concerning the maintenance of fertility have been presented , but it is believed that the statements so ...
... reason some things have been omitted which might have been discussed with profit in a larger work . Only the more important facts concerning the maintenance of fertility have been presented , but it is believed that the statements so ...
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... treatment of the subject thoroughly practical , and for this reason the minimum of theory and the maximum of demonstrated facts will be given , and with the least possible use of technical language . Be-. + FIRST PRINCIPLES OF SOIL ...
... treatment of the subject thoroughly practical , and for this reason the minimum of theory and the maximum of demonstrated facts will be given , and with the least possible use of technical language . Be-. + FIRST PRINCIPLES OF SOIL ...
Página 6
... reason that if the crops now produced on two hundred acres could be grown upon one hundred , the returns would be greater , provided the labor and other expense involved were not materially increased ; for in the latter case the ...
... reason that if the crops now produced on two hundred acres could be grown upon one hundred , the returns would be greater , provided the labor and other expense involved were not materially increased ; for in the latter case the ...
Página 16
... reason for their adoption . The reader is asked to carry this thought with him as he reads the following pages . Part of the Oxygen from the Air . - A small quan- tity of the oxygen in the plant probably comes from the air . One - fifth ...
... reason for their adoption . The reader is asked to carry this thought with him as he reads the following pages . Part of the Oxygen from the Air . - A small quan- tity of the oxygen in the plant probably comes from the air . One - fifth ...
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... reason , stirring up the soil , and thus introducing air , increases the rate of nitrification . Nor can these bac- teria thrive in a soil that is acid , so that the presence of carbonate of lime , or some other substance that will ...
... reason , stirring up the soil , and thus introducing air , increases the rate of nitrification . Nor can these bac- teria thrive in a soil that is acid , so that the presence of carbonate of lime , or some other substance that will ...
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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