Philosophical Transactions of the Royal Society of London, Band 180W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1890 |
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acid solution acre ammonia amount of nitrogen Anomodont apex Aral Sea articular border Cabinet number cells cent centims chorda clover combined nitrogen concave condyle convex cortex crop-residue degeneration depth Dicynodon distal dorsal experiments extends external extraction foramen free nitrogen gain Galesaurus gram growth inches increase injection kilog Klich leguminous leguminous crop length to breadth Lepidodendron lesion less loss lupins manure margin maxillary median Medicago sativa medulla medullary Melilotus mgrm millig millims mineral manure nitric acid nitrification nitrogen nitrogen as nitric obtained occipital organic substance outward parietal percentage of organic percentage of salts pilocarpin plants Plate plot posterior pterygoid pyramidal tract quadrate bone rate of secretion ratio of length roots Rothamsted saliva samples seen side skull specimen squamosal stimulation subsoil surface soil suture terrace Theriodont Titanosuchus tracheids transverse section Trifolium repens Trifolium repens soil variation vascular bundle vertebræ vertical Vicia wheat-fallow whilst
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Seite 97 - ... some of them, at any rate, may acquire nitrogen brought into combination under the influence of lower organisms, the development of which is, apparently, in some cases, a coincident of the growth of the higher plant whose nutrition they are to serve.
Seite 43 - It was about 1876, that M. Berthelot called in question the legitimacy of the conclusion that plants do not assimilate the free nitrogen of the air, when drawn from the results of experiments in which the plants were so enclosed as to exclude the possibility of electrical action.
Seite 89 - In our earlier papers we had concluded that, excepting the small amount of combined nitrogen annually coming down in rain and the minor aqueous deposits from the atmosphere, the source of the nitrogen of...
Seite 2 - ... it is generally admitted that all the evidence that has been acquired, on lines of inquiry until recently followed, has failed to solve the problem. During the last few years, however, the discussion has assumed a somewhat different aspect. The question still is, whether free nitrogen is an important source of the nitrogen of vegetation generally, but especially of the...
Seite 98 - WOLFF does not suppose that free nitrogen is fixed by the plants themselves ; nor does he favour the view that it was fixed by the agency of micro-organisms. The plants may take up combined nitrogen from the air by their leaves ; but he thinks it more probable that combined nitrogen is absorbed from the air by the soil, and that free nitrogen is fixed within the soil under the influence of porous and alkaline bodies. He admits that it is not explained why cereals do not benefit by these actions as...
Seite 8 - ... repens had previously been grown, with those where the deeper rooting Vicia sativa had yielded fair crops, it was found that, at every depth of 9 inches down to a total depth of 108 inches, the Vicia soil contained much less nitric acid than the Trifolium repens soil ; and it was concluded that much if not the -whole, of the nitrogen of the Vicia crops had been taken up as nitric acid. New results of the same 'kind, which related to experiments with Trifolium repens as a shallow rooting and meagrely...
Seite xvii - Bateson, W. 1889. On Some Variations of Cardium edule apparently correlated to the Conditions of Life.
Seite 9 - ... much as in the Wheat, and more than thirteen times as much as in the Red Clover. Indeed, this very deeply, and very powerfully rooting plant, yielded, in its above-ground produce alone, 337 Ibs. of nitrogen in 1884, 270 Ibs. in 1885, 167 Ibs. in 1886, 247 Ibs. in 1887, and 161 Ibs. in 1888. TABLE XV. Estimated yield of Nitrogen per acre, in Ibs., in Wheat alternated with Fallow, and in various Leguminous Crops, without Nitrogenous Manure. PRELIMINARY PKRIOD.
Seite iii - Angularity of the subjects, or the advantageous manner of treating them, without pretending to answer, or to make the Society answerable, for the certainty of the facts, or propriety of the reasonings, contained in the several Papers so published, - which must still rest on the credit or judgment of their respective Authors.