Studies in soil bacteria of the subtropical regions—Punjab, North India
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Summary and Conclusions
In this paper the seasonal variations for bacterial numbers have been described in manured and unmanured field soils in the Punjab.
Two maxima in the middle of October and beginning of May, and two minima in the end of January and in the first week of August were obtained.
The variations of bacterial numbers in the soil cannot be explained as entirely to be due to any of the physical factors individually, but may be the result of the accumulative effect of all the factors of which the temperature seems to be the most important.
It may be stated that in our soils the number of bacteria as occurring on the plate method is higher than those reported by the European and American workers.
Different types of bacteria seem to be appearing and disappearing at different seasons of the year as indicated by a spreading type ofBacterium, but an exclusive study of this problem is desired before any definite statement could be made.
KeywordsMoisture Content Soil Bacterium Field Soil Bacterial Number Spreading Type
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- 1.Brown, P. E., and Helverson, W. V.Iowa Agr. Bxp. Sta. Res. Bull., 1919,56, 251–58.Google Scholar
- 2.Conn, H.J. Centbl. Bact., 1910,2, 28.Google Scholar
- 3.Cutler, D. W., Crump, L. M., and Sandon, H.Phil. Trans. Roy. Soc., Series B, 1922,211, 317–50.Google Scholar
- 5.Given and WillisPenn. Agr. Bxp. Sta. Ann. Report, 1911–12, 441–54.Google Scholar
- 7.Hiltner and StörnierArb. K. Gesundhtsamt., Biol. Arbt., 1903, Heft 5, 445.Google Scholar
- 8.Lemmermann, O., and Wickers, J. L.Centr. Bakt., 1920,50, Abt. II, 33.Google Scholar
- 9.Lockhead, A. C.Trans. Roy. Soc. Canada, 1923,18 (V), 382–423.Google Scholar
- 10.Löhnis, F., and Sabaschnikoff, A.Centr. Bakt., 1908,20, Abt. II, 322.Google Scholar
- 12.Müntz, A., and Gaudechon, H.Comptes Rend. Akad. Sci., 1912,154, 163.Google Scholar
- 13.Newton, J. D.Soil Agr. (Ottawa), 1930,10, 361–66.Google Scholar
- 14.Remy, T.Centr. Baht. 8, Abt. II, 761.Google Scholar
- 15.Russell, E.J. Jour. Agr. Sci., 1913,5.Google Scholar
- 16.Russell, E. J., and AppleyardIbid., 7.Google Scholar
- 20.-Principles of Soil Microbiology, 1932.Google Scholar
- 21.Wilson, G. K.Soil Sci., 1930, No. 5, 289.Google Scholar
- 22.Wojtkiewicz, A.Centr. Bakt., 1914,42, Abt. II, 254.Google Scholar