First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 13
... inches deep . This again takes no account of the quantity of water lost from the land by percolation or drainage . It has been estimated that this amount is at least equal to that used by vegetation , so that one acre of corn pro- bably ...
... inches deep . This again takes no account of the quantity of water lost from the land by percolation or drainage . It has been estimated that this amount is at least equal to that used by vegetation , so that one acre of corn pro- bably ...
Página 14
... 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 8.40 18.0 12.84 9.40 10.08 Functions of Water . - Water is important to the 14 FIRST ...
... 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 8.40 18.0 12.84 9.40 10.08 Functions of Water . - Water is important to the 14 FIRST ...
Página 64
... inches on the side , presents a sur- face of 24 square inches . If this cube is cut once in each direction 8 cubes are formed , each one inch on a side , giving a total of 48 square inches of surface , so that cutting only once in each ...
... inches on the side , presents a sur- face of 24 square inches . If this cube is cut once in each direction 8 cubes are formed , each one inch on a side , giving a total of 48 square inches of surface , so that cutting only once in each ...
Página 68
... inch , and their aggre- gate surface will be 31.416 square inches . If , however , the diameters of these spheres be reduced to one- hundredth of an inch 1,000,000 of them will be required to make a cubic inch and their total surface ...
... inch , and their aggre- gate surface will be 31.416 square inches . If , however , the diameters of these spheres be reduced to one- hundredth of an inch 1,000,000 of them will be required to make a cubic inch and their total surface ...
Página 70
... inches deep of very dry soil , so dry and loose that it can not take up the water from the layer next beneath it . The same end can be attained by covering the ground with loose straw or other similar material , the principle underlying ...
... inches deep of very dry soil , so dry and loose that it can not take up the water from the layer next beneath it . The same end can be attained by covering the ground with loose straw or other similar material , the principle underlying ...
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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