First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 10
... shown that of these thirteen , three are probably not necessary to plant growth , leaving only ten elements that are essential . The table shows that three elements ( i . e . hydrogen ,. ΙΟ FIRST PRINCIPLES OF SOIL FERTILITY.
... shown that of these thirteen , three are probably not necessary to plant growth , leaving only ten elements that are essential . The table shows that three elements ( i . e . hydrogen ,. ΙΟ FIRST PRINCIPLES OF SOIL FERTILITY.
Página 13
... shown that approximately 300 pounds of water Experiment to show that water is given off passes through the plant for each pound of dry matter pro- duced , so that 1,000 pounds of corn uses at least 30 tons of water from the leaves of ...
... shown that approximately 300 pounds of water Experiment to show that water is given off passes through the plant for each pound of dry matter pro- duced , so that 1,000 pounds of corn uses at least 30 tons of water from the leaves of ...
Página 15
... 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 replace the loss by evaporation from the leaves . It is probable that water performs an ...
... 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 replace the loss by evaporation from the leaves . It is probable that water performs an ...
Página 20
... use the carbon in the soil . It will be shown later that such manures may be indirectly beneficial to the plant , however . CHAPTER III NITROGEN AS A PLANT FOOD Nitrogen the Most 20 FIRST PRINCIPLES OF SOIL FERTILITY.
... use the carbon in the soil . It will be shown later that such manures may be indirectly beneficial to the plant , however . CHAPTER III NITROGEN AS A PLANT FOOD Nitrogen the Most 20 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 28
... shown that all soils do not contain the bacteria necessary to Root tubercles on soy beans . The left inoculated and the other uninocula- ted . Tubercles appear only when the proper bacteria are present in the soil the fixation of free ...
... shown that all soils do not contain the bacteria necessary to Root tubercles on soy beans . The left inoculated and the other uninocula- ted . Tubercles appear only when the proper bacteria are present in the soil the fixation of free ...
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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