First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 5
... supply . Plants of First Importance to the Farmer . - All agriculture depends upon the growth of plants , and consequently the profit that accrues to the farmer de- pends primarily upon the value of the crops his farm produces . In some ...
... supply . Plants of First Importance to the Farmer . - All agriculture depends upon the growth of plants , and consequently the profit that accrues to the farmer de- pends primarily upon the value of the crops his farm produces . In some ...
Página 15
... supplies the hydrogen and oxygen found in the dry matter , which amounts to 10 per cent more , making a total of 90 per cent of the weight of the plant which is derived directly from the water . Water is necessary to dissolve the plant ...
... supplies the hydrogen and oxygen found in the dry matter , which amounts to 10 per cent more , making a total of 90 per cent of the weight of the plant which is derived directly from the water . Water is necessary to dissolve the plant ...
Página 16
... supply is sufficient to grow the maximum crop of which the soil is capable , as is de- monstrated by the fact that a large increase in yield can be obtained by irrigation even in sections of very heavy precipitation . While the amount ...
... supply is sufficient to grow the maximum crop of which the soil is capable , as is de- monstrated by the fact that a large increase in yield can be obtained by irrigation even in sections of very heavy precipitation . While the amount ...
Página 19
... supply might some day be exhausted . The bulk of the atmosphere is so enormous , however , that the total amount of carbonic acid is very large . Johnson calculated that the atmosphere when taken to its entire height contains not less ...
... supply might some day be exhausted . The bulk of the atmosphere is so enormous , however , that the total amount of carbonic acid is very large . Johnson calculated that the atmosphere when taken to its entire height contains not less ...
Página 20
... supply of carbon . Carbon Costs the Farmer Nothing . The point of practical importance brought out by this study of the fixation of carbon is that the carbon is furnished free of cost . In other words the carbon compounds pro- duced in ...
... supply of carbon . Carbon Costs the Farmer Nothing . The point of practical importance brought out by this study of the fixation of carbon is that the carbon is furnished free of cost . In other words the carbon compounds pro- duced in ...
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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