First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 28
... not thrive on it at all . This fact explains many of the disappointments experienced by farmers in the trials of some of the more recently Effect of inoculation on yield . The plant on the. 28 FIRST PRINCIPLES OF SOIL FERTILITY.
... not thrive on it at all . This fact explains many of the disappointments experienced by farmers in the trials of some of the more recently Effect of inoculation on yield . The plant on the. 28 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 29
Alfred Vivian. Effect of inoculation on yield . The plant on the left came from a plot where all the plants had nodules on roots ; the other from a plot where prac- tically none of the plants had nodules . The yield was in the ratio of ...
Alfred Vivian. Effect of inoculation on yield . The plant on the left came from a plot where all the plants had nodules on roots ; the other from a plot where prac- tically none of the plants had nodules . The yield was in the ratio of ...
Página 41
... effect of the removal of the crop upon the amount of plant food in the soil , then , it will simplify matters to confine . attention to the three substances nitrogen , phosphoric acid and. SOIL AS A SOURCE OF PLANT FOOD 41.
... effect of the removal of the crop upon the amount of plant food in the soil , then , it will simplify matters to confine . attention to the three substances nitrogen , phosphoric acid and. SOIL AS A SOURCE OF PLANT FOOD 41.
Página 50
... effect upon the minerals of which the igneous rocks are composed . The water that enters the ground has dissolved in ... Effect of freezing on a piece of limestone Effect of. 50 FIRST PRINCIPLES OF SOIL FERTILITY.
... effect upon the minerals of which the igneous rocks are composed . The water that enters the ground has dissolved in ... Effect of freezing on a piece of limestone Effect of. 50 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 51
... Effect of freezing on a piece of limestone Effect of weathering on a limestone ledge . Notice that. ORIGIN OF THE SOIL 51.
... Effect of freezing on a piece of limestone Effect of weathering on a limestone ledge . Notice that. ORIGIN OF THE SOIL 51.
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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