Prospects of industrial cultivation of remontant raspberry in the Republic of Komi in the context of thermal resources of the region

We analyzed the main agroclimatic indicators of thermal resources on the territory of Syktyvkar (Komi Republic) for the period of 1991–2023. According to the results of earlier field experiments on cultivation of remontant raspberry, we isolated the years with the most favorable conditions for fruit ripening, which satisfy the requirements of industrial cultivation of the culture by share of ripened berries in total yield. Using the method of correspondence analysis, we revealed the characteristics of temperature regime of vegetation periods for these years. The recurrence (frequency) of these periods was calculated for the interval of 1991–2020. The climatic characteristics of the interval were considered as modern. The high proportion of ripened berries in 2023 was associated with the increased values of the sums of active and effective air temperatures above 10°C in the first and second decades of May, the third decade of September, the first and second decades of October. To realize its potential, remontant raspberry needs a long vegetation period with high average daily temperatures (above 10° C) during the period of mass ripening of berries. Thus, the thermal resources of the Komi Republic (Syktyvkar area) do not provide conditions for industrial cultivation of remontant raspberry because the growing seasons, covering the needs of the culture in heat, are repeated only once in 30 years.