First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 21
... constituents , but that it is the most expensive element to be furnished by means of ferti- lizers , and is also , unfortunately , the element most easily lost and wasted . The Nitrogen of Most Plants Comes from the Soil . -Most of the ...
... constituents , but that it is the most expensive element to be furnished by means of ferti- lizers , and is also , unfortunately , the element most easily lost and wasted . The Nitrogen of Most Plants Comes from the Soil . -Most of the ...
Página 22
... constituents of the plant become a part of the soil . As long as the nitrogen remains in this form it is of no value to the new genera- tion of plants , for the organic matter must first be decomposed , and the nitrogen changed into the ...
... constituents of the plant become a part of the soil . As long as the nitrogen remains in this form it is of no value to the new genera- tion of plants , for the organic matter must first be decomposed , and the nitrogen changed into the ...
Página 31
... constituents of the atmosphere as of any importance to the plant . These writers thought the presence of mineral matter merely accidental , and due to the fact that the plant took it because it was dissolved in the necessary soil water ...
... constituents of the atmosphere as of any importance to the plant . These writers thought the presence of mineral matter merely accidental , and due to the fact that the plant took it because it was dissolved in the necessary soil water ...
Página 33
... constituents 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 ...
... constituents 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 ...
Página 37
... constituent of proteids and is necessary to their formation . Sulphur is found in some of the proteids but its special function is not known . Phos- phoric acid is supposed to be in some way connected with the transportation of the ...
... constituent of proteids and is necessary to their formation . Sulphur is found in some of the proteids but its special function is not known . Phos- phoric acid is supposed to be in some way connected with the transportation of the ...
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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.