Abstract
Experiments on growing petunia seedlings in protected ground conditions were carried out in 2020-2022 on the basis of the greenhouse complex of the Don State Agrarian University in the Oktyabrsky district of the Rostov region. The object of research was a hybrid of petunia Grandi-flora Limbo JP. The repetition of the experience is fourfold. The scheme of the experiment in-cluded variants with containers of 450, 350 and 230 cm3. Peat, sand, fertilizer based on Karelian shungite "Shungiterra" and organic mineral fertilizer Agrovit-Core were used to prepare the sub-strate for growing seedlings. The highest indicators of the quality index in the experiment were obtained using a substrate consisting of ¾ peat, ¼ sand and fertilizer "ShungiTerra" based on Ka-relian shungite of the Turastamozr deposit (substrate mixed with Shungiterra 1: 10). When using containers with a substrate volume of 450 cm3, the seedling quality index increased by 0.40 com-pared to the control variant, with a volume of 350 cm3 – by 0.17 and 230 cm3 – by 0.13. Keywords: VOLUME, FERTILIZER, SUBSTRATE, QUALITY INDEX, HYBRID PETUNIA
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