Annual report of the Board of Control of the New York Agricultural Experiment Station . (the sametype as used in the pot experiments) were made during three succes-sive winters; but only the results secured in 1913-14 have sufficientmeaning to justify publication in detail. During 1911-12 no con-stant temperature was available for use in the incubation of theplates, a condition which rendered the results unreliable. Sevensamples of frozen soil were taken during that winter, of whichtwo showed between thirty-five and forty million bacteria per gram,counts which are much higher than ordinarily o
Annual report of the Board of Control of the New York Agricultural Experiment Station . (the sametype as used in the pot experiments) were made during three succes-sive winters; but only the results secured in 1913-14 have sufficientmeaning to justify publication in detail. During 1911-12 no con-stant temperature was available for use in the incubation of theplates, a condition which rendered the results unreliable. Sevensamples of frozen soil were taken during that winter, of whichtwo showed between thirty-five and forty million bacteria per gram,counts which are much higher than ordinarily obtained from thissoil when in an unfrozen condition. In the winter of 1912-13 thesoil was unfrozen except for two short periods, and only six sampleswere taken, of which only two were obtained as much as two weeksafter a freeze. One of these two counts reached the striking figureof 55,000,000 bacteria per gram. 190 Report of the Department of Bacteriology of the BACTEfUft 1^13NOV. DEC. 1314 / / 7— A / / N / V 60 5040302010 MOISTURE40 302010 FROZEN FROZEN POT 1 pot a TEMPERATURE 15. (IKAIII VII. lUCTEKIAL, COUNTS IN UnAERATED SOIL, Pot EXPERIMENT, L913-14. Bacteria in millions per gram; moisture conicni iii percentage, dry basis;temperature In degrees Centigrade, average per week. New York Agricultural Experimext Station. 191 Table V.— Bacterial Counts of Field of Dunkirk silty clay loam. Date. Unaerated. Aerated, 1911. Aerated, 1913. Remarks. Bacteriaper gramdry soil. 3 cI| Bacteriaper gramdry soil. 3 o •§*s Bacteriaper gramdry soil. Nov. 24, 1913Nov. 26, 1913Dec. 15, 1913Jan. 16, 1914Jan. 30,1914Feb. 7,1914Feb. 26, 1914April 15, 1914April 29, 1914 Perct. Perct. Perc*. 40,000,000 9 1 21 31 20 16,666,00011,000,00019,000,00033,000,00030,000,00038,000,00021,000,00016,000,000 23 28 20,000,00013,500,00018,000,00034,000,00
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