Stimulation of root formation in semi-hardwood cuttings of Juniperus x pfitzeriana ‘Pfitzeriana Glauca’ with growth powders with auxins

The results of a study of the effect of growth powders containing indolyl-3-butyric acid (IBA) in various concentrations on root formation in semi-hardwood cuttings of Juniperus × Pfitzeriana ‘Pfitzeriana Glauca’ are presented. Cuttings were harvested from eight-year-old mother plants at the end of forced winter dormancy. A stimulating effect on the rooting of cuttings of this variety of growth powders with a concentration of IBA of 2.5 g/kg was shown, which consisted in an increase in the percentage of rooting of cuttings by 2.0-2.19 times and a significant improvement in the quality of the root system. With an increase in the concentration of IBA in growth powders from 2.5 g/kg to 20 g/kg, there was a decrease in the percentage of survival and an increase in signs of phytotoxicity of the growth regulators on cuttings.