First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 6
... hand , it is apparent that nothing is gained by increased production per acre if the larger crop is ob- tained at a total expenditure in excess of that required for the smaller yield . As a matter of fact , our most successful farmers ...
... hand , it is apparent that nothing is gained by increased production per acre if the larger crop is ob- tained at a total expenditure in excess of that required for the smaller yield . As a matter of fact , our most successful farmers ...
Página 17
... through the decom- position of organic matter , or in other words , must have their food previously prepared for them . Green plants , on the other hand , can manufacture their ATMOSPHERE AS A SOURCE OF PLANT FOOD 17.
... through the decom- position of organic matter , or in other words , must have their food previously prepared for them . Green plants , on the other hand , can manufacture their ATMOSPHERE AS A SOURCE OF PLANT FOOD 17.
Página 18
Alfred Vivian. plants , on the other hand , can manufacture their own food from the inorganic materials of the soil and atmo- sphere . Sunlight Necessary to Carbon Fixation . - The de- composition of carbonic acid by the plant , and the ...
Alfred Vivian. plants , on the other hand , can manufacture their own food from the inorganic materials of the soil and atmo- sphere . Sunlight Necessary to Carbon Fixation . - The de- composition of carbonic acid by the plant , and the ...
Página 32
... hand . In order to determine which elements are essential , plants were grown , either in specially pre- pared sand or by the " water - culture method , " in such a way that they were supplied with all the elements. Liebig.
... hand . In order to determine which elements are essential , plants were grown , either in specially pre- pared sand or by the " water - culture method , " in such a way that they were supplied with all the elements. Liebig.
Página 33
... hand , the plant failed to develop , that particular element was considered to be essential . The numerous experiments of this kind which have been carried on show that of the ash constituents potash , lime , phosphoric acid , magnesia ...
... hand , the plant failed to develop , that particular element was considered to be essential . The numerous experiments of this kind which have been carried on show that of the ash constituents potash , lime , phosphoric acid , magnesia ...
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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