Published in Scientific Papers. Series B, Horticulture, Vol. LXV, Issue 1
Written by Gabi-Mirela MATEI, Sorin MATEI, Elena Maria DRĂGHICI
The presence of hydrocarbons and salts in oil-polluted soils is responsible for inappropriate water, air and nutrients regimes, with negative consequences for plants growth. The aim of this paper is to present the results of research carried out to improve soil conditions for microbial communities, using a mix of oil-polluted soil from Icoana farm, Olt county with Perlite and natural stimulators and fertilizers (AMALGEROL, VERMIPLANT, POCO, IGUANA and FORMULEX) in greenhouse experiments with bean (Phaseolus vulgaris L. cultivar UNIDOR). The paper presents the total counts of bacteria and fungi (estimated by dilution plate) and soil respiration (by substrate-induced respiration method). All the natural products and perlite significantly increased bacterial populations and reduced the fungal counts, especially pathogenic species. Biodiversity was stimulated in bacterial communities, generally dominated by Pseudomonas fluorescens, Bacillaceae and Actinomycetes. The dominance of antagonistic fungi Trichoderma viride and Fusarium oxysporum was recorded in myco-coenoses from variants with perlite and in variants treated with VERMIPLANT, IGUANA or POCO. Soil respiration was stimulated by the better substrate aeration with perlite and the natural stimulators and fertilizers FORMULEX and IGUANA.
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