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This study was conducted in order to determine the effect of inoculation with Endorize-TA AMF and soil amendment with compost of urban waste; consisting of decomposed grass clippings, leaves, and wood chips, without sewage sluge, (Eko-Compost); on the growth and flowering of French marigold in the growing substrate polluted with Cd, Pb, and Zn. French marigold was found relatively tolerant to heavy metals in the growing substrate. Differences in growth of plants in the substrates unpolluted and polluted with heavy metals were negligible. The lowermost leaves of plants grown in heavy metal polluted substrates had necrotic margins. Mycorrhization with AMF did not improve the growth and aesthetic value of plants grown in the substrates polluted with heavy metals. Compost supply had beneficial effect on the growth and quality of plants grown in substrates polluted with heavy metals. Compost supply decreased the Pb and Zn contents in shoots of French marigold.
A laboratory experiment was conducted in 2015 to evaluate the germination energy and capacity of seeds of four ornamental plant species, treated with various biologically active substances. Three replications of the experiment were performed in three independent series. The experimental materials comprised seeds of four ornamental plant species: China aster (Callistephus chinensis (L.) Nees), scarlet sage (Salvia splendens Sellow ex Roemer & J.A. Schultes), common zinnia (Zinnia elegans Jacq.) and French marigold (Tagetes patula L.), which constituted the first experimental factor. The second experimental factor were biostimulants used for seed pre-conditioning: Effective Microorganisms, Trichoderma spp. and Goёmar Goteo. Seeds soaked in distilled water were the control. French marigold seeds were characterised by the highest average germination energy and capacity in three experimental series (mean values) and in each of the series. Scarlet sage seeds had the lowest germination energy, and common zinnia seeds had the lowest germination capacity in experimental series 1 and 3 and in three series (mean values). The biostimulants used for pre-conditioning exerted varied effects on the germination energy and capacity of seeds of the analysed ornamental plant species. The plant species compared in the study responded differently to the tested biostimulants. The germination energy and capacity of seeds of Callistephus chinensis (L.) Ness and Tagates patula L. decreased in response to the applied biostimulants.
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