First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 15
... give stiffness or rigidity to the more succulent parts of the plant . This fact is shown by the drooping or wilting of plants during the hot hours of the day when the water is not furnished by the roots with sufficient rapidity to ...
... give stiffness or rigidity to the more succulent parts of the plant . This fact is shown by the drooping or wilting of plants during the hot hours of the day when the water is not furnished by the roots with sufficient rapidity to ...
Página 42
... gives the amount of nitrogen , phos- phoric acid and potash in 1,000 pounds of some of the important crops , the different materials being selected to show something of the range of composition . AMOUNT OF FERTILIZING INGREDIENTS IN ...
... gives the amount of nitrogen , phos- phoric acid and potash in 1,000 pounds of some of the important crops , the different materials being selected to show something of the range of composition . AMOUNT OF FERTILIZING INGREDIENTS IN ...
Página 43
... gives the amounts of nitrogen , phosphoric acid and potash removed from an acre by a few of the common crops . ( Adapted from Van Slyke . ) AMOUNT OF FERTILITY REMOVED FROM AN ACRE KIND OF CROP YIELD Corn , grain only . Clover hay ...
... gives the amounts of nitrogen , phosphoric acid and potash removed from an acre by a few of the common crops . ( Adapted from Van Slyke . ) AMOUNT OF FERTILITY REMOVED FROM AN ACRE KIND OF CROP YIELD Corn , grain only . Clover hay ...
Página 44
... gives the amount of nitrogen , phosphoric acid and potash in the first foot of typical sandy loam , clay loam and clay soils . AMOUNT OF PLANT FOOD PER ACRE IN THE SURFACE FOOT Sandy loam Clay loam . Clay . KIND OF SOIL Nitrogen , Lbs ...
... gives the amount of nitrogen , phosphoric acid and potash in the first foot of typical sandy loam , clay loam and clay soils . AMOUNT OF PLANT FOOD PER ACRE IN THE SURFACE FOOT Sandy loam Clay loam . Clay . KIND OF SOIL Nitrogen , Lbs ...
Página 45
... give the total amount of nitrogen , phosphoric acid and potash in the soil , but do not indicate what part of these foods is available to the plant . The greater proportion of these substances is locked up in insoluble compounds , in ...
... give the total amount of nitrogen , phosphoric acid and potash in the soil , but do not indicate what part of these foods is available to the plant . The greater proportion of these substances is locked up in insoluble compounds , 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