First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 11
... 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 ... potash is composed of potassium and oxygen ; phosphoric acid is phosphorus and oxygen ; lime is calcium and oxygen ...
... 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 ... potash is composed of potassium and oxygen ; phosphoric acid is phosphorus and oxygen ; lime is calcium and oxygen ...
Página 33
... 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- different , as they can grow to maturity in the absence of these ...
... 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- different , as they can grow to maturity in the absence of these ...
Página 37
... acid sub- stance that has a solvent action on that part of the soil which is ... compounds of the plant and form about 981⁄2 per cent of the green corn crop ... Potash is thought to be neces- sary to the conversion of starch into sugar ...
... acid sub- stance that has a solvent action on that part of the soil which is ... compounds of the plant and form about 981⁄2 per cent of the green corn crop ... Potash is thought to be neces- sary to the conversion of starch into sugar ...
Página 39
Alfred Vivian. solved compounds containing nitrate nitrogen , phos- phoric acid and potash . If the water that leaches . through this soil is analyzed , it is found that the potash It is a dangerous practice to allow soils to remain bare ...
Alfred Vivian. solved compounds containing nitrate nitrogen , phos- phoric acid and potash . If the water that leaches . through this soil is analyzed , it is found that the potash It is a dangerous practice to allow soils to remain bare ...
Página 40
... phosphoric acid than the subsoil . Third , by denitrification . This has been referred to ... acid gas . These substances are furnished free of cost in humid climates ... potash ) are likely to become ex- 40 FIRST PRINCIPLES OF SOIL FERTILITY.
... phosphoric acid than the subsoil . Third , by denitrification . This has been referred to ... acid gas . These substances are furnished free of cost in humid climates ... potash ) are likely to become ex- 40 FIRST PRINCIPLES OF SOIL FERTILITY.
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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
Pasajes populares
Página 225 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and 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 1 - ... woods ; All silent is the earth and sky, Except with his own lonely moods The blackbird holds a colloquy. Over the broad hill creeps a beam, Like hope that gilds a good man's brow, And now ascends the nostril-stream Of stalwart horses come to plough.
Página 245 - 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.