Influence of microbial preparations on biomorphological indicators of tulip (<i>Tulipa</i> L.) ‘Anna Krasavitsa’ and soil fertility under steppe Crimea conditions

The data on the study of the effect of treatment of tulip bulbs of the Anna Krasavitsa cultivar before planting with microbial preparations (MP) Aurill and the Complex of microbial preparations (CMP) on the growth, state, ability for vegetative propagation of tulips, as well as the fertility and biological activity of the tulip rhizosphere in Crimea have been presented in the article. The studies were carried out in 2017-2019 in a small-plot field experiment on the tulip collection site of the NBG-NSC (v. Novy Sad, Simferopol district of the Republic of the Crimea) on the southern carbonate chernozem. Tulip bulbs were treated with MP working suspensions before planting with a dose of the preparation equal to 2 % of the bulb mass. The control - treatment with tap water. The study, collection and processing of the obtained data on the state of plants, fertility and biological activity of the soil was carried out by generally accepted methods. As a result of the studies was found that MPs increased the coefficient of vegetative propagation of bulbs, the mass of the nest and replacement bulb by 6-23 %, at the same time, a positive effect of CMP on an increase in the mass of large bulbs was revealed in the axils of the storage scales. The features of the influence of the treatment of tulip bulbs ‘Anna Krasavitsa’ with Aurill and CMP preparations on the morphometric characteristics of the plant have been revealed: the height and size of the flower and the lower leaf were increased. A positive effect of the preparations on soil fertility under tulips was shown: CMP promoted an increase in the organic matter content in the soil by 0.19 %, Aurill - the accumulation of nitrate nitrogen and exchangeable potassium in the rhizosphere of a tulip, and increasing its biological activity. The use of MP increased the number of ammonifying and amylolytic bacterial groups in the rhizosphere of the tulip; to a greater extent, Aurill, CMP increased the number of phosphate-mobilizing (by 58 %), as well as oligotrophic and cellulolytic bacteria by 8 and 78 % respectively. Aurill suppressed the number of micromycetes by 48 %.