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)
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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