First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 7
... kind yielded in the forty - third year 10 bushels of dressed grain per 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 ...
... kind yielded in the forty - third year 10 bushels of dressed grain per 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 ...
Página 33
... kind which have been carried on show that of the ash constituents potash , lime , phosphoric acid , magnesia , iron and sul- phuric acid are absolutely essential to plant growth . Toward soda , chlorine and silica plants seem to be in ...
... kind which have been carried on show that of the ash constituents potash , lime , phosphoric acid , magnesia , iron and sul- phuric acid are absolutely essential to plant growth . Toward soda , chlorine and silica plants seem to be in ...
Página 43
... KIND OF CROP YIELD Corn , grain only . Clover hay . Cabbage . Barley . Wheat . Wheat . Oats .. Tobacco . • • · Timothy hay Pounds of Nitrogen Pounds of Phosphoric Acid Pounds of Potash 45 bus . 100 100 120 2 tons 15 30 bus . " 100 15 ...
... KIND OF CROP YIELD Corn , grain only . Clover hay . Cabbage . Barley . Wheat . Wheat . Oats .. Tobacco . • • · Timothy hay Pounds of Nitrogen Pounds of Phosphoric Acid Pounds of Potash 45 bus . 100 100 120 2 tons 15 30 bus . " 100 15 ...
Página 44
... KIND OF SOIL Nitrogen , Lbs . per acre Phosphoric Acid , Lbs . per acre Potash , Lbs . per acre 3,736 7,326 28,669 4,789 4,935 44,827 3,250 5,600 12,600 The large amount of plant food present in the soil is surprising , in view of the ...
... KIND OF SOIL Nitrogen , Lbs . per acre Phosphoric Acid , Lbs . per acre Potash , Lbs . per acre 3,736 7,326 28,669 4,789 4,935 44,827 3,250 5,600 12,600 The large amount of plant food present in the soil is surprising , in view of the ...
Página 95
... Kind of soil Sand Sandy clay Loam Humus Pounds of water in one cubic foot 27.3 . 38.8 • 41.4 50.1 It will be seen that the quantity of water increases with the amount of humus present , the sand containing the least and the loam which ...
... Kind of soil Sand Sandy clay Loam Humus Pounds of water in one cubic foot 27.3 . 38.8 • 41.4 50.1 It will be seen that the quantity of water increases with the amount of humus present , the sand containing the least and the loam which ...
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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