First Principles of Soil FertilityKegan Paul, Trench, Trubner, 1910 - 265 páginas |
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Página 16
... rain- fall ; a fact that will be emphasized throughout this book . Too much stress can not be laid upon the im- portance to the plant of an adequate supply of water in the soil , and the knowledge that certain methods increase the ...
... rain- fall ; a fact that will be emphasized throughout this book . Too much stress can not be laid upon the im- portance to the plant of an adequate supply of water in the soil , and the knowledge that certain methods increase the ...
Página 22
... rain water during showers and are carried into the soil . The quantity received by the soil from this source is very small , amounting only to from 3 to 8 pounds an acre a year , the maximum amount being less than one - tenth of that ...
... rain water during showers and are carried into the soil . The quantity received by the soil from this source is very small , amounting only to from 3 to 8 pounds an acre a year , the maximum amount being less than one - tenth of that ...
Página 26
... rain water . He found that while in most cases there was no gain of nitrogen , in some cases there was a decided increase . Those plants which produced a gain in nitrogen invariably belong to the same family as the pea , bean , clover ...
... rain water . He found that while in most cases there was no gain of nitrogen , in some cases there was a decided increase . Those plants which produced a gain in nitrogen invariably belong to the same family as the pea , bean , clover ...
Página 39
... rains . Thousands of acres of good lands have been destroyed in this country in the manner shown in this illustration and phosphoric acid have been removed by the soil , but that the nitrogen all remains in the leachings . Second , by ...
... rains . Thousands of acres of good lands have been destroyed in this country in the manner shown in this illustration and phosphoric acid have been removed by the soil , but that the nitrogen all remains in the leachings . Second , by ...
Página 51
... rain- water , and this amount , though very small , is probably sufficient to enable plant growth to begin . Some bac- Mosses growing on granite boulder . They must have small food require- ments or great powers of obtain- ing it ...
... rain- water , and this amount , though very small , is probably sufficient to enable plant growth to begin . Some bac- Mosses growing on granite boulder . They must have small food require- ments or great powers of obtain- ing it ...
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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