The micro-organisms of the soil

by Edward J. Russell; Rothamsted Experimental Station

X-axis: Nov.-May

Y-axis (bottom): Temperature—Degrees C.

Y-axis (top): Bacteria—Millions per Gramme of Soil.

REFERENCES TO CHAPTERS II. AND III.

[1] Ashby, S. F., Journ. Agric. Sci., 1907, vol. ii., p. 35.

[2] Beijerinck, M. W., Centr. f. Bakt., 1900, Abt. II., Bd. 6, p. 1.

[3] Beijerinck, M. W., and Van Delden, A., Centr. f. Bakt., 1902, Abt. II., Bd. 9, p. 3.

[4] Bewley, W. F., and Hutchinson, H. B., Journ. Agric. Sci., 1920, vol. x., p. 144.

[5] Bonazzi, E., Journ. Bact., 1921, vol. vi., p. 331.

[6] Burrill, T. J., and Hansen, R., Illin. Exp. Sta., 1917, Bulletin 202.