土壌の天然的研究(第二報) 土壌微生物に及ぼす温度の影響

概要

論文の詳細を見る
In the previous paper, a method for collecting the soil samples under the natural state was described in detail. This Paper deals with the results obtained in the laboratory by using the soil samples collected by the said procedure, regarding the influence of temperature on the microorganisms as well as the rate of temperature change in the monolith itself after placed in the incubator and also the change of pH values. Five soil samples in all, two from unmanured and one from manured rice-field, and two from dry-farm, were taken and placed in an incubator at 28℃. The results are summarised as follows : 1.) It required 26-31 hours to reach 28℃ from 5℃-14℃ which were the original temperature. 2.) The pH values of rice-field soils became somewhat smaller while no change was observed with the dry-farm soils. 3.) The maximum number of bacteria was reached after 84 hours of incubation in the case of rice-field soils while it took only 60 hours with the dry-farm soils. However no marked difference was noted among the samples as to the ratio of increase. 4.) The change of fungous number showed the similar tendency as the bacteria.
社団法人日本土壌肥料学会の論文
1937-02-20