First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 6
... acre . It stands to reason that if the crops now produced on two hundred acres could be grown upon one hundred , the returns would be greater , provided the labor and other expense involved were not materially increased ; for in the ...
... acre . It stands to reason that if the crops now produced on two hundred acres could be grown upon one hundred , the returns would be greater , provided the labor and other expense involved were not materially increased ; for in the ...
Página 7
... acre ; the average for the last eight years being 1134 bushels . Wheat grown in the same way for fifty years produced in the fiftieth year 934 bushels of grain per acre ; the average for the last eight years being 111⁄2 bushels . In ...
... acre ; the average for the last eight years being 1134 bushels . Wheat grown in the same way for fifty years produced in the fiftieth year 934 bushels of grain per acre ; the average for the last eight years being 111⁄2 bushels . In ...
Página 13
... acre , it follows that to mature an acre of corn the crop must be sup- plied with 900 tons of water , or an amount that would make a layer over the acre about 8 inches deep . This again takes no account of the quantity of water lost ...
... acre , it follows that to mature an acre of corn the crop must be sup- plied with 900 tons of water , or an amount that would make a layer over the acre about 8 inches deep . This again takes no account of the quantity of water lost ...
Página 14
... ACRE REQUIRED TO PRO- DUCE DIFFERENT YIELDS OF GRAIN Yield per acre 15 20 30 40 50 60 . Acre Inches of Water Required Wheat Barley Oats Corn 4.5 3.24 2.35 2.52 6.0 4.28 3.14 3.36 9.0 6.42 5.7 5.04 • 12.0 8.56 6.27 6.72 15.0 10.70 7.84 ...
... ACRE REQUIRED TO PRO- DUCE DIFFERENT YIELDS OF GRAIN Yield per acre 15 20 30 40 50 60 . Acre Inches of Water Required Wheat Barley Oats Corn 4.5 3.24 2.35 2.52 6.0 4.28 3.14 3.36 9.0 6.42 5.7 5.04 • 12.0 8.56 6.27 6.72 15.0 10.70 7.84 ...
Página 19
... 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 sufficient , without renewal , for a hundred years of growth . As a matter of fact , the supply of ...
... 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 sufficient , without renewal , for a hundred years of growth . As a matter of fact , the supply of ...
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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