Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. XI
Written by Sorin MATEI, Gabi-Mirela MATEI, Elena Maria DRĂGHICI
Expanded perlite, resulted by in heating process of a naturally occurring perlite ore, make it an versatile and law-impact material for greenhouse, soil amendment, hydroponics, and which offers advantages such as aeration, drainage, water retention, resistance, reuse. By bioaugmentation with chemotrophic microorganisms that decompose natural / manufactured rocks, expanded perlite can be biotransformed into an organic-like substrate. In the present study, the microorganisms responsible for the biotransformation of expanded perlite into organic-like substrates were analized for compatibility, interspecific synergy (bacteria, fungi, diazotrophs), the organic content by chromatography, humic-like fractions, siderophores, enzyme complex, seed germination and the growing of plantlets. The results reflected the effect of living organisms synergism in the ascendent evolution of organic compounds accumulation. The secondary exomethabolites are involved in humic-like acids fractions formation and biotransformation of the rock, increasing polyphenoloxidase activity, in conversion towards organic-like substrate and in association with colloids. Also, increse in time the siderophores and IAA content in substrate, intensity of physiological and biochemical processess, the seed germination and the plantlets's biomass.
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