First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 3
... the fertility she had been storing up for count- less ages . A system of extravagant and unbusiness- like farming , however , has so impoverished the soil , in some parts of our country , that many farms 3 CHAPTER PAGE I Introductory.
... the fertility she had been storing up for count- less ages . A system of extravagant and unbusiness- like farming , however , has so impoverished the soil , in some parts of our country , that many farms 3 CHAPTER PAGE I Introductory.
Página 17
... less due to the breathing process of the cell , the heat in this case being unable to escape . Carbon in Plants Derived from the Air . - Nearly one - half of the dry matter in the plant consists of the element carbon , all of which is ...
... less due to the breathing process of the cell , the heat in this case being unable to escape . Carbon in Plants Derived from the Air . - Nearly one - half of the dry matter in the plant consists of the element carbon , all of which is ...
Página 18
... less dry matter than was present in the seed . In the presence of light , however , the plant absorbs the carbonic acid of the air by means of its leaves , and causes the carbon to com- bine with the water and mineral matter taken in ...
... less dry matter than was present in the seed . In the presence of light , however , the plant absorbs the carbonic acid of the air by means of its leaves , and causes the carbon to com- bine with the water and mineral matter taken in ...
Página 19
... less than 3,400,000,000 , - ooo tons of carbonic acid . This amounts to about 28 tons over every acre of the earth's surface , and as only one - fourth of the earth's surface is land he estimated that the carbonic acid in the air is ...
... less than 3,400,000,000 , - ooo tons of carbonic acid . This amounts to about 28 tons over every acre of the earth's surface , and as only one - fourth of the earth's surface is land he estimated that the carbonic acid in the air is ...
Página 22
... less than one - tenth of that required by a crop of corn . Nearly all of the nitrogen in the soil is present in the more or less decayed organic matter left behind by the plants that it has previously produced . Plants build up the ...
... less than one - tenth of that required by a crop of corn . Nearly all of the nitrogen in the soil is present in the more or less decayed organic matter left behind by the plants that it has previously produced . Plants build up the ...
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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