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Abstract: Natural soil samples are denoted by their geological origin, the kind and quantity of organic supplements, their state of mineralization, and the resulting microbial populations which are widely fixed by these factors. Attempts to inoculate untreated, soils with deviating bacterial and fungal populations which do not match this given framework of nutrient supply and microbial competition are therefore sentenced to fail in their great majority. No progress has therefore been achieved in establishing antibiotically active antagonists in soil which were expected to control plant root pathogens (Garrett, 1960; Baker and Cook, 1974) as well as in introducing N-P-K assimilating bacterial preparations in formyard soils for improving the yield potential of field crops (Trolldenier, 1961; Revira, 1965). In absence of available exogenous nutrients propagules of lower fungi persist in a state of dormancy which is maintained by self-produced vacuolation factors (stalling factors); (Park, 1961; Park and Robinson, 1964) and the general soil. fungistasis (Hora et al., 1977). Supply with proper nutrients revitalizes growth of microfungi in a specific pattern of successive hierarchy. Although mycelia of basidiomycetous fungi do not appear to underlie the influence of both stalling (Park, 1961) and soil fungistasis, the apparent poverty in and inavailability of soil nutrients results in a nearly complete failure when basidiomycetous mycelia are reinoculated into soils from which they had previously been isolated (Poppe, 1970/71; Gramss, 1980, in press). This natural barrier to, artificial spread of soil-inhabiting basidiomycetous fungi blocks any attempts of maintaining fungal populations in overpopulated areas, or to keep certain edible mushrooms unfit to be grown industrially in semi-culture. The present study examines two ways of influencing the rate of mycelial establishment and fruiting of edible mushrooms in soil substrates.
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