Summary:

The aim of the study was to forecast sugar beet yield increases under the influence of sprinkler irrigation in the Bydgoszcz region, depending on three climate change scenarios. Three climate change scenarios were considered: RCP4.5, RCP8.5, and SRES A1B. Sugar beet root yield increases under the influence of sprinkler irrigation (Q) depending on precipitation during the critical period (PVII-VIII) were determined using the equation Q = 0.356 (241 - PVII-VIII). Calculations were performed for the forecast period (2021-2050), with the 30-year period 1991-2020 as the reference period. The possible yield increases for sugar beet roots over the forecast period (2021-2050) ranged from 34.9 t·ha^-1 to 63.0 t·ha^-1 in average years, 45.1 t·ha^-1 to 67.5 t·ha^-1 in moderately dry years, and 50.2 t·ha^-1 to 69.8 t·ha^-1 in very dry years. From the three climate change scenarios analyzed, higher production effects of sprinkler irrigation on sugar beet are achievable under the SRES A1B model. The presented very high production effects of sprinkler irrigation on sugar beet can become the basis for assessing the economic effectiveness of this treatment and, consequently, constitute an important premise for making decisions on the advisability of sprinkler irrigation for this species under the conditions of predicted climate change in the Bydgoszcz region.