The objective of research is to identify the optimal method for growing common hop planting material. In 2024, the Chuvashia Research Institute of Agriculture conducted a study on the effects of growth stimulants on biological and economic indicators. Improved Flagman hop plants, obtained through clonal micropropagation at the Altai Center for Applied Biotechnology of Altai State University, were planted in a greenhouse and open field and foliar sprayed with various growth stimulants. The maximum increase in the number of roots, stems, and green mass was achieved in the greenhouse using Albit, while the greatest root length was achieved in the open field using the same product. Better establishment and survival rates, as well as the yield of standard seedlings, were also observed when using this product in the greenhouse. However, the open field variant with this stimulant proved to be the most profitable – 33.1% versus 16.3% in the greenhouse. A comparison of open-ground seedling production from in vitro-produced plants with traditional green cuttings showed that, despite the higher yield of standard seedlings from rooted cloned plants due to the faster and more vigorous development of the root system and aboveground mass, green cuttings proved to be significantly more cost-effective. At the same time, given the lack of mother plants in Russia, clonal micropropagation of hops allows for the production of the required number of seedlings from a limited number of mother plants and is the only viable option for introducing new breeding achievements to the market. When establishing mother plants for hop nurseries, it is advisable to use in vitro-improved material treated with Albit for subsequent use as source material for green cuttings.
Dementiev et al. (Fri,) studied this question.