First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 11
... Phosphoric Acid 1.2 Lime 1.6 Magnesia 1.4 Iron Oxide 0.3 Sulphuric Acid 0.3 Soda 0.4 Silica 2.4 ( NOTE . All of the elements mentioned above as occurring in the ash , with the exception of chlorine , are combined with oxygen . In the ...
... Phosphoric Acid 1.2 Lime 1.6 Magnesia 1.4 Iron Oxide 0.3 Sulphuric Acid 0.3 Soda 0.4 Silica 2.4 ( NOTE . All of the elements mentioned above as occurring in the ash , with the exception of chlorine , are combined with oxygen . In the ...
Página 33
... phosphoric acid , magnesia , iron and sul- phuric acid are absolutely essential to plant growth . Toward soda , chlorine and silica plants seem to be in- different , as they can grow to maturity in the absence of these substances . For ...
... phosphoric acid , magnesia , iron and sul- phuric acid are absolutely essential to plant growth . Toward soda , chlorine and silica plants seem to be in- different , as they can grow to maturity in the absence of these substances . For ...
Página 39
... phosphoric acid have been removed by the soil , but that the nitrogen all remains in the leachings . Second , by surface washing . In hilly countries this may be a very important factor . As the soil is re- moved bodily from the surface ...
... phosphoric acid have been removed by the soil , but that the nitrogen all remains in the leachings . Second , by surface washing . In hilly countries this may be a very important factor . As the soil is re- moved bodily from the surface ...
Página 40
... phosphoric acid than the subsoil . Third , by denitrification . This has been referred to in a previous chapter and may be of great moment in a soil that is not properly managed . The conditions that are desirable in the soil are such ...
... phosphoric acid than the subsoil . Third , by denitrification . This has been referred to in a previous chapter and may be of great moment in a soil that is not properly managed . The conditions that are desirable in the soil are such ...
Página 41
Alfred Vivian. phosphoric acid and potash ) are likely to become ex- hausted , or , in other words , that nothing is gained by adding to the soil any of the other elements of plant food . This is due to the fact that the plant uses nitro ...
Alfred Vivian. phosphoric acid and potash ) are likely to become ex- hausted , or , in other words , that nothing is gained by adding to the soil any of the other elements of plant food . This is due to the fact that the plant uses nitro ...
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Términos y frases comunes
acid and potash acre agricultural ammonia amount of nitrogen amount of plant animals applied 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 solid soluble substances sufficient sulphate superphosphate supply surface tillage tion urine wheat yield
Pasajes populares
Página 187 - The production possible from a definite amount of plant -food can be secured only when the conditions are such as to permit its proper solution, distribution and retention by the soil. The fact that fertilizers may now be easily secured, and the ease of application, have encouraged a careless use, rather than a thoughtful expenditure, of an equivalent amount of money or energy in the proper preparation of the soil.
Página 221 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and thus that the economical use of this expensive element, nitrogen, is dependent to a large degree upon the abundance of the mineral elements In the soil. It is therefore advocated that for all crops and for all soils that are in a good state of cultivation, a reasonable excess of phosphoric acid and potash...
Página 241 - One will seek to know what the different forms of plant-food are, what they do, from what sources they can be obtained, and how he can use them to best advantage. He will become to some extent an investigator, and will, of necessity, take a deeper interest in his work.
Página 225 - When such crops as corn, cabbage, grass, potatoes, etc., have a luxuriant, healthful growth, an abundance of potash in the soil is indicated ; also, when fleshy fruits of fine flavor and texture can be successfully grown. (e). When a soil produces good, early maturing crops of grain, with plump and heavy kernels, phosphoric acid will not generally be found deficient in the soil. Such general indications may often be most helpful, and crops should be studied carefully with these facts in mind.