First Principles of Soil FertilityOrange Judd, 1908 - 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 Acre Inches of Water Required Wheat Barley Oats Corn 15 4.5 3.24 2.35 2.52 20 6.0 4.28 3.14 3.36 30 9.0 6.42 5.7 5.04 40 12.0 8.56 6.27 6.72 50 15.0 10.70 7.84 8.40 60 ...
... ACRE REQUIRED TO PRO- DUCE DIFFERENT YIELDS OF GRAIN Yield per acre Acre Inches of Water Required Wheat Barley Oats Corn 15 4.5 3.24 2.35 2.52 20 6.0 4.28 3.14 3.36 30 9.0 6.42 5.7 5.04 40 12.0 8.56 6.27 6.72 50 15.0 10.70 7.84 8.40 60 ...
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
Pasajes populares
Página 225 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and the economical use of this expensive element, nitrogen, is dependent to a large degree upon the abundance of the mineral elements in the soil. It is, therefore, advocated that for all crops and for all soils that are in a good state of cultivation, a reasonable excess of phosphoric acid and potash...
Página 1 - ... woods ; All silent is the earth and sky, Except with his own lonely moods The blackbird holds a colloquy. Over the broad hill creeps a beam, Like hope that gilds a good man's brow, And now ascends the nostril-stream Of stalwart horses come to plough.
Página 245 - One will seek to know what the different forms of plant-food are, what they do, from what sources they can be obtained, and how he can use them to best advantage. He will become to some extent an investigator, and will, of necessity, take a deeper interest in his work.