Rooting of bird cherry green cuttings depending on the rhizogenesis inducer

European bird cherry and common chokeberry are among the most winter-hardy fruit plants. These species are moisture-loving but tolerate lack of moisture relatively well. This paper evaluates the methods of the simplest and most efficient technologies for growing the planting material. One of the available ways to propagate bird cherry is green cuttings with the use of various growth stimulants. The solution of potassium humate available in free realization as a stimulant of root formation in green cut tings of the selected samples of bird cherry was tested. The effect of solutions of biogenic ferrihydrite nanoparticles in pure form and doped with manganese (Feh + Mn), cobalt (Feh + Co), silicon (Feh + Si) was investigated in comparison with humates. Citric acid was used to prevent aggregation and in crease the stability of the colloidal solution of nanoparticles. It was found that application of humates has high efficiency on the cuttings of different forms and varieties of bird cherry. It was determined that the rooting ability of green cuttings of different varieties and forms of bird cherry treated with nanoparticle solutions differs depending on the doping metal. The positive response of the cuttings treated with solutions of ferrihydrite nanoparticles in different modification was observed. Among the studied modifications of nanoparticles, cobalt-doped ferrihydrite had the best effect on the percentage of rooting and quality of the root system of the planting material of the hard-to-root hybridized variety Rosovaya Mechta. The lowest rooting rate (about 52%) in this cultivar was observed in the variant treated with a solution of pure ferrihydrite nanoparticles, the highest (90%) in the variant treated with a solution of cobalt-doped ferrihydrite nanoparticles. In the variant with ferrihydrite doped with manga nese and silicon, the rooting rate of the cuttings was lower by 6 and 9% compared to the control variant (about 83%), in which the cuttings were treated with 3% potassium humate solution.

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