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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)


Page 71

  71 
1955] pgrsidky & Wilde_~Eff~t of EracliCO~fltS on Soils 
age values and suggest that the direct observations of the behavior of ~j~roorgafl1sms
may have considerable value in analyses of soils treated with biocides and
commercial fertilizers (Wilde and Krumm, 1946). 
 The effect of eradicants on the growth of nursery stock and the development
of symbiotic mycorrhizal fungi was studied in sand cultures, using Pinus
radiata as the test plant. The results are presented in Figure 1 and Table
3. 
 FIGURE 2. Effect of biocides on the develoPment of root tips or "short roots"
of Pinus ' radiata seedlings. A and B, normal bifurcate mycorrhizal short
roots with a well developed Hartig net, produced in biocide-free soils or
in the presence of mildly concentrated less toxic biocides C to F, simple
pedunculate short roots of a ~~pseudomYcorrh a1" type, prevalent in soils
or soil regions containing biocides in a high concentratiolt 
 Calomel is the only chemica' which ~onspicUou5ly inhibited the development
of seedlings and drastically disrupted the normal top-root ratio. Other biocides
at this rate of application did not decrease significantlY the weights of
total seedlings, their tops, or their roots. In some instances, the application
of biocides stimulated the production of dry matter. As a rule, the presence
of eradicants reduced the quantitative top-root ratios. However, as many
previous studies have shown, the appraisal of nursery 


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