Dicke, Robert J. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XLIV (1955)
Persidsky, D. J.; Wilde, S. A.
Effect of eradicants on the microbiological properties of nursery soils, pp. 65-73 ff. PDF (2.7 MB)
70 Wisconsin Academy of Sciences, Arts and Letters [Vol. 44 the most unfavorable influence. A strong depressing effect is also caused by thiosan and benzene hexachioride. Chiordane proved to be the least inhibiting; this behaviour may have a bearing upon observations of Voigt (1953) who recorded a high rate of oxygen uptake by root tips in the presence of chlordane suspensions. FIGURE 1. Growth of 1—0 P1~u~ ' radiata seedlings in a coarse sandy soil treated with different biocides at the indicated rate of application: A— Untreated soil; B—Chlordane, 10 lbs/A; C—Thiosan, 125 lbs/A; D—Allyl alcohol, 50 gal/A; E—Benzene hexachioride (gamma isomer), 1.0 lbs/A; F—Calomel, 40 lbs/A. The direct influence of different biocides on the development of fungi was investigated by observing the growth of Aspergillus niger in a suspension prepared from 20 g. of soil and 30 ml of nutrient solution (Mehlich, Truog, and Fred, 1933). Inoculated soils were incubated for 5 days at 350 C. The weights of mycelia, given in Table 2, indicate that the most unfavorable influence, reducing the growth of mycelia about 50 per cent, is exerted by allyl alcohol and calomel. Chlordane proved to be the least toxic. The triplicate results give rather small deviations from the aver-
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