First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 8
... materials were removed from the soil when the crop was harvested . It is not possible to explain the rapid decrease in fertility on any other basis ; for it can not be ascribed to any changes in climatic conditions . The change in the ...
... materials were removed from the soil when the crop was harvested . It is not possible to explain the rapid decrease in fertility on any other basis ; for it can not be ascribed to any changes in climatic conditions . The change in the ...
Página 9
... materials with which we are familiar are com- plex and are combinations of two or more elements . Such bodies are called compounds . While the number of elements is small there are many thousands of com- pounds . This is due to the fact ...
... materials with which we are familiar are com- plex and are combinations of two or more elements . Such bodies are called compounds . While the number of elements is small there are many thousands of com- pounds . This is due to the fact ...
Página 15
... materials absorbed by the roots , and that manufactured by the leaves can be trans- ported to the different parts of the plant where they are needed only when in solution in water . Of such consequence to vegetation is the water sup ...
... materials absorbed by the roots , and that manufactured by the leaves can be trans- ported to the different parts of the plant where they are needed only when in solution in water . Of such consequence to vegetation is the water sup ...
Página 16
... materials in the cells one of the results being the production of heat , just as the oxidation taking place in the animal body produces heat . That heat is evolved by the living vegetable cell can easily be proved experimentally by ...
... materials in the cells one of the results being the production of heat , just as the oxidation taking place in the animal body produces heat . That heat is evolved by the living vegetable cell can easily be proved experimentally by ...
Página 17
... material of the plant should be formed from this gas , but it is well known that green plants have the power to decompose this gas , retaining the carbon and setting free the oxygen . This process is known as the " fixation ( sometimes ...
... material of the plant should be formed from this gas , but it is well known that green plants have the power to decompose this gas , retaining the carbon and setting free the oxygen . This process is known as the " fixation ( sometimes ...
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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