First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
Dentro del libro
Resultados 6-10 de 25
Página 71
... Plowing to Conserve Moisture . - Plow- ing the ground late in the fall tends to save the mois- ture , as the loose ground turned up by the plow pre- vents loss of water by evaporation . The broken uneven An surface also makes it ...
... Plowing to Conserve Moisture . - Plow- ing the ground late in the fall tends to save the mois- ture , as the loose ground turned up by the plow pre- vents loss of water by evaporation . The broken uneven An surface also makes it ...
Página 72
... plowed in the fall contained 1.15 acre inches more water than an adjacent plot not so plowed . It must be borne in mind , however , that fall plowing is not a practice capable of universal application , for there are certain hard soils ...
... plowed in the fall contained 1.15 acre inches more water than an adjacent plot not so plowed . It must be borne in mind , however , that fall plowing is not a practice capable of universal application , for there are certain hard soils ...
Página 73
... plowed . Quiroga , in a thesis pre- sented to the College of Agriculture , Ohio State Uni- versity , reports that the moisture content of the early plowed plots was higher than the late plowed through- out the season . He found also ...
... plowed . Quiroga , in a thesis pre- sented to the College of Agriculture , Ohio State Uni- versity , reports that the moisture content of the early plowed plots was higher than the late plowed through- out the season . He found also ...
Página 90
... plowing . Another Point of View . - There are , however , two sides to the question of the desirability of summer fallows . King cites experiments of his own which show ( by determinations made April 30 ) that the plots which had been ...
... plowing . Another Point of View . - There are , however , two sides to the question of the desirability of summer fallows . King cites experiments of his own which show ( by determinations made April 30 ) that the plots which had been ...
Página 92
... plow the land immediately after the removal of one crop and keep it well stirred until the planting of the next . By this means loss of moisture from the soil is prevented and the decomposition of the organic matter is hastened , so ...
... plow the land immediately after the removal of one crop and keep it well stirred until the planting of the next . By this means loss of moisture from the soil is prevented and the decomposition of the organic matter is hastened , so ...
Otras ediciones - Ver todas
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.