First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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... HENGIST HORNE . " When tillage begins , other arts follow . The farmers . therefore , are the founders of human civilization . " DANIEL WEBSTER . ACKNOWLEDGMENTS The author desires to acknowledge his obligation to the.
... HENGIST HORNE . " When tillage begins , other arts follow . The farmers . therefore , are the founders of human civilization . " DANIEL WEBSTER . ACKNOWLEDGMENTS The author desires to acknowledge his obligation to the.
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... Tillage · VII . Drainage and Irrigation VIII . Summer Fallowing IX . Humus and Green - manuring X. Rotation of Crops · · XI . Factors Affecting Value of Fresh Manure XII . Amount and Value of Manure produced on Farm XIII . Losses in ...
... Tillage · VII . Drainage and Irrigation VIII . Summer Fallowing IX . Humus and Green - manuring X. Rotation of Crops · · XI . Factors Affecting Value of Fresh Manure XII . Amount and Value of Manure produced on Farm XIII . Losses in ...
Página 58
... Nature undisturbed returns all the plant food removed from the soil , by the decay of the plants which it has produced An incompleted soil . Good tillage will hasten the decomposition. 58 FIRST PRINCIPLES OF SOIL FERTILITY.
... Nature undisturbed returns all the plant food removed from the soil , by the decay of the plants which it has produced An incompleted soil . Good tillage will hasten the decomposition. 58 FIRST PRINCIPLES OF SOIL FERTILITY.
Página 62
... spring plowing on the conservation of moisture . The darker plots were plowed earlier than the lighter ones and contained several tons more water per acre . CHAPTER VI TILLAGE Tillage Increases Feeding Ground for Roots.- The.
... spring plowing on the conservation of moisture . The darker plots were plowed earlier than the lighter ones and contained several tons more water per acre . CHAPTER VI TILLAGE Tillage Increases Feeding Ground for Roots.- The.
Página 63
Alfred Vivian. CHAPTER VI TILLAGE Tillage Increases Feeding Ground for Roots.- The most efficient means of assisting nature in the con- version of unavailable food into forms that the plant Plowing is the most important tillage operation ...
Alfred Vivian. CHAPTER VI TILLAGE Tillage Increases Feeding Ground for Roots.- The most efficient means of assisting nature in the con- version of unavailable food into forms that the plant Plowing is the most important tillage operation ...
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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
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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.