Agricultural Investigations at Rothamsted, England, During a Period of Fifty Years: Six Lectures Delivered Under the Provisions of the Lawes Agricultural TrustU.S. Government Printing Office, 1895 - 316 pagina's |
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86 pounds nitrogen accumulation acre per annum albuminoids ammonium salts amount of nitrogen amounts of potash animals applied average produce barley Beans or clover bushels carbohydrates carbon carbonic acid cent cereal common turnips comparatively composition continuous course dry matter dry substance experiments fallow farmyard manure feeding forty free nitrogen given growth higher increase in live land Lastly leaf Leguminosa leguminous crops less live weight mangels manure plat milk mineral matter mixed manure Mixed mineral manure nitrate of soda nitric acid nitro nitrogen per acre nitrogenous manure nitrogenous substance nitrogenous supply nodules obtained percentage of nitrogen period phosphoric acid pigs plants plat potash pounds of nitrogen proportion quantity rape cake residue root crops Roots fed Rothamsted seasons sheep soda sodium nitrate sugar beet superphosphate surface soil Swedish turnips tion tons total nitrogen total produce Trifolium repens unmanured urea wheat yield of nitrogen
Populaire passages
Pagina 9 - Memoranda of the origin, plan, and results of the field and other experiments conducted on the farm and in the laboratory of Sir JB Lawes at Rothamsted, Herts.
Pagina 302 - The amount of tissue metamorphosed in a given time, may be measured by the quantity of nitrogen in the urine. "The sum of the mechanical effects produced in two individuals, in the same temperature, is proportional to the amount of nitrogen in their urine; whether the mechanical force has been employed in voluntary or involuntary motions, whether it has been consumed by the limbs, or by the heart and other viscera.
Pagina 140 - ... more probable that the lower organisms fix the free nitrogen. If this should eventually be established, we have to recognize a new power of living organisms — that of assimilating an elementary substance.
Pagina 303 - In conclusion, it must by no means be understood that we would in any way depreciate the value of even a somewhat liberal amount of nitrogen in food. We believe, however, that on the current views too high a relative importance is attached to it; and that it would conduce to further progress in this most important field of inquiry if the prevailing opinions on the subject were somewhat modified*.
Pagina 239 - ... lamb, 249 sheep, and 59 pigs. The percentages of water, mineral matter, fat, and nitrogenous substance, were determined in certain separated parts, and in the entire bodies, of ten animals — namely, one calf, two oxen, one lamb, four sheep, and two pigs. Complete analyses of the ashes, respectively, of the entire carcases, of the mixed internal and other ' offal ' parts, and of the entire bodies, of each of these ten animals have also been made.
Pagina 174 - ... so derive any portion of their nitrogen. (4) When crops are grown year after year on the same land, for many years in succession without nitrogenous manure, both the amount of produce per acre and the amount of nitrogen in it, decline in a very marked degree. This is the case even when a full mineral manure is applied, and it is the case not only with cereals and with root crops, but also with Leguminom.
Pagina 152 - It should be observed that there was this greatly increased assimilation of carbon in the wheat and in the barley for more than twenty years, without the addition of any carbon to the soil. It is, indeed, certain that, in the existing condition of our...
Pagina 313 - I propose to take up the subject of the feeding of animals, for the production of meat, milk, and manure, and for the exercise of force — that is, for their labour. Also, if opportunity should occur, to treat of the question of the application of town-sewage to the land. Finally, I should observe that, throughout the illustrations which I shall bring before you, it will be my endeavour to keep in view the bearing of the data with...
Pagina 136 - ... arranged that some of the plants of each description could be taken up, and their roots and nodules studied, at successive periods of growth : the annuals at three periods — namely, first when active vegetation was well established, secondly when it was supposed that the point of maximum accumulation had been approximately reached, and thirdly when nearly ripe ; and the plants of longer life at four periods — namely, at the end of the first year, and in the second year when active vegetation...
Pagina 73 - It is obvious that different seasons will differ almost infinitely at each succeeding period of their advance, and that, with each variation, the character of development of the plant will also vary, tending to luxuriance, or to maturation, that is, to quantity or to quality, as the case may be. Hence, only a very detailed consideration of climatic statistics, taken together with careful periodic observations in the field, can afford a really clear perception of the connection between the ever-fluctuating...