First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 47
... rocks , of which the granites and trap are good examples . Geology teaches that the earth was once a molten mass , and that upon cooling it solidified into rocks , of which those men- tioned are ... rock crevices helps. 47 Origin of the Soil.
... rocks , of which the granites and trap are good examples . Geology teaches that the earth was once a molten mass , and that upon cooling it solidified into rocks , of which those men- tioned are ... rock crevices helps. 47 Origin of the Soil.
Página 48
... rock into the small particles in which they are found in the ground . The rocks have been . disintegrated through the influence of heat and cold , freezing. The freezing of the water in the rock crevices helps to break the rocks into ...
... rock into the small particles in which they are found in the ground . The rocks have been . disintegrated through the influence of heat and cold , freezing. The freezing of the water in the rock crevices helps to break the rocks into ...
Página 49
... rock into its com- ponent parts . All rocks are more or less porous , and consequently , ab- sorb water , and the ex- pansion of this water when frozen tends to break the mass into fragments . Perhaps more important in this grinding ...
... rock into its com- ponent parts . All rocks are more or less porous , and consequently , ab- sorb water , and the ex- pansion of this water when frozen tends to break the mass into fragments . Perhaps more important in this grinding ...
Página 50
... rocks into forms available to plants ,. Running water is constantly changing the face of the earth , cutting out ravines and grinding the rock to powder Effect of freezing on a piece of limestone Effect of. 50 FIRST PRINCIPLES OF SOIL ...
... rocks into forms available to plants ,. Running water is constantly changing the face of the earth , cutting out ravines and grinding the rock to powder Effect of freezing on a piece of limestone Effect of. 50 FIRST PRINCIPLES OF SOIL ...
Página 51
Alfred Vivian. matter of the rocks into forms available to plants , but the mineral foods alone can not support the higher plant life . It has been shown that to grow crops the soil must contain available nitrogen , and this must have ...
Alfred Vivian. matter of the rocks into forms available to plants , but the mineral foods alone can not support the higher plant life . It has been shown that to grow crops the soil must contain available nitrogen , and this must have ...
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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