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The influence of potsherds on nitrification in the Indian alluvium
Published online by Cambridge University Press: 27 March 2009
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Nitrogen, one of the most important plant nutrients, is present in the soil mainly as organic compounds which, with certain exceptions, are not, in those forms, assimilable by ordinary cultivated plants. The organic compounds undergo a series of chemical changes before they are ultimately changed into nitrates which are practically the most useful compounds of nitrogen which can be taken up by plants.
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- Copyright © Cambridge University Press 1918
References
Page 32 note 1 “Soil Ventilation and Soil Aeration in Agriculture,” Agr. Res. Inst., Pusa, Bull. 52 and 61; also “The Manurial Value of Potsherds,” Agric. Journ. India, 1916, 11, p. 256.Google Scholar
Page 35 note 1 Nitrates were determined colorimetrically by the phenol disulphonic acid method. The dissolved oxygen and the oxygen required were estimated by Rideal’s and by Forschammer’s processes respectively.
Page 39 note 1 Russell, E. J. and Appleyard, A., “The Atmosphere of the Soil,” Journ. Agric. Sci. 1915, 7, p. 1;CrossRefGoogle Scholar E. H. Richards, “Dissolved Oxygen in Rain-water,” ibid. 1917, 8, p. 331; also E. J. Russell and A. Appleyard, “The Influence of Soil Conditions on the Decomposition of Organic Matter in the Soil,” ibid. p. 385.
Page 40 note 1 “Soil Temperatures,” Memoirs Dept. Agr. India, Chem. Series, 4, no. 2.Google Scholar
Page 40 note 2 Howard, A., “Soil Ventilation,” Agr. Research Inst., Pusa, Bull. 52, pp. 10, 11.Google Scholar