First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 61
Alfred Vivian. PART II MAKING POTENTIAL PLANT FOOD AVAILABLE The effect of early spring plowing on the conservation of.
Alfred Vivian. PART II MAKING POTENTIAL PLANT FOOD AVAILABLE The effect of early spring plowing on the conservation of.
Página 62
Alfred Vivian. The effect of early 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 ...
Alfred Vivian. The effect of early 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 ...
Página 63
... Plowing is the most important tillage operation . It should be so done as to leave the minimum amount of work for ... plows , harrows , cultivators or any other implement , either before or after the seed is sown . The most noticeable ...
... Plowing is the most important tillage operation . It should be so done as to leave the minimum amount of work for ... plows , harrows , cultivators or any other implement , either before or after the seed is sown . The most noticeable ...
Página 65
... plow heavy , lumpy land in the fall so that it may be exposed to the influence of the weather during the winter . For this purpose the land is so plowed as to leave it rough and with the largest possible area ex- posed to the weather ...
... plow heavy , lumpy land in the fall so that it may be exposed to the influence of the weather during the winter . For this purpose the land is so plowed as to leave it rough and with the largest possible area ex- posed to the weather ...
Página 70
... plowing , as methods of tillage especially recommended for the con- servation of soil moisture . The Earth Mulch to Conserve Moisture . - During dry weather water is constantly being evaporated from the surface of the ground . Under ...
... plowing , as methods of tillage especially recommended for the con- servation of soil moisture . The Earth Mulch to Conserve Moisture . - During dry weather water is constantly being evaporated from the surface of the ground . Under ...
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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.