First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 3
... possible returns for the money and labor involved . It is not enough simply to grow crops , but they must be so produced as to yield a profit on the capital invested . To succeed , he must be thoroughly acquainted with every detail of ...
... possible returns for the money and labor involved . It is not enough simply to grow crops , but they must be so produced as to yield a profit on the capital invested . To succeed , he must be thoroughly acquainted with every detail of ...
Página 4
... treatment of the subject thoroughly practical , and for this reason the minimum of theory and the maximum of demonstrated facts will be given , and with the least possible use of technical language . Be-. 4 FIRST PRINCIPLES OF SOIL ...
... treatment of the subject thoroughly practical , and for this reason the minimum of theory and the maximum of demonstrated facts will be given , and with the least possible use of technical language . Be-. 4 FIRST PRINCIPLES OF SOIL ...
Página 5
Alfred Vivian. with the least possible use of technical language . Be- fore taking up the subject of manures and fertilizers it is desirable to devote a short time to the considera- tion of plant food in general , explaining what it is ...
Alfred Vivian. with the least possible use of technical language . Be- fore taking up the subject of manures and fertilizers it is desirable to devote a short time to the considera- tion of plant food in general , explaining what it is ...
Página 8
... possible to explain the rapid decrease in fertility on any other basis ; for it can not be ascribed to any changes in climatic conditions . The change in the physical condition of the soil has been suggested as a possible explanation ...
... possible to explain the rapid decrease in fertility on any other basis ; for it can not be ascribed to any changes in climatic conditions . The change in the physical condition of the soil has been suggested as a possible explanation ...
Página 30
... possible before he attempts inoculation . Other Ways in which Nitrogen is Fixed . - Within the last few years a number of bacteria have been dis- covered in the soil which have the power , when culti- vated in the laboratory , of using ...
... possible before he attempts inoculation . Other Ways in which Nitrogen is Fixed . - Within the last few years a number of bacteria have been dis- covered in the soil which have the power , when culti- vated in the laboratory , of using ...
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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.