USE OF GROWTH STIMULANTS IN BERRY CROPS NURSERY
On the basis of the landscape design laboratory of the Chuvash Agrarian University, the effect of plant growth stimulants (regulators) during vegetative propagation of red and black currants was investigated. Experiments were carried out when rooting cuttings of red currant variety Mechta and black currant variety Legenda during winter and summer cuttings in 2020. Growth stimulants such as Heteroauxin, Kornevin, Epin-extra and Amber acid were used according to the available instructions. A soil substrate based on peat and sand together with vermiculite was used as a soil. In the course of the experiments, a positive effect of growth stimulants on the formation of callus on cuttings, on the process of rooting and survival of young plants, both during summer and winter cuttings, was recorded. It is well known that currants take root well when rooting. It was found that almost equally high rooting rates were recorded both during winter and summer propagation using plant growth stimulants (regulators). Berry cuttings respond positively to the use of growth stimulants. According to the instructions, the cuttings were soaked prior to planting and then sprayed or watered after planting. During two years of experiments, it was proved that the use of all plant growth stimulants had a positive effect on the results, which turned out to be higher than the control variant (without the use of regulators). Moreover, when propagating red currants, the best result was shown by the option with the use of Kornevin. When breeding black currant, the best result was found in the variant with the use of Heteroauxin. The use of these drugs (Heteroauxin and Kornevin) led to consistently high results both during winter and summer cuttings. The survival rates of cuttings in the open field in the second year of their life turned out to be the highest when using these options. For red currants during winter grafting it was 97%, during summer one it was 93%; for black currant it was 97 and 96%, respectively.