Prediction of crop yield and biomass in agricultural production is crucial for both food safety and national economic projections. This study aimed to determine the relationship between the effects of climate change and biomass and grain yield of two crops (winter wheat and sunflower) at two locations, Kirklareli (KRK), Edirne-Orhaniye (EOR), with different soil textures, in the Thrace region. The scenarios (n=S1, S2,…,S65) of sensitivity analysis established by considering the expected trend of climate change were evaluated in terms of biomass and grain yield for sunflower and winter wheat crops with the AquaCrop model. The model predicted the highest losses of grain yield and biomass, when the air temperature was increased by 5 °C and the precipitation was decreased by 50% during the growing seasons of both crops (in the scenario S42). In the scenarios where only temperature was increased, grain and biomass yield values of sunflower was decreased, while those of winter wheat was increased. The combined effects of increased global solar radiation and decreased temperature had a negative effect on wheat production at EOR. For both sunflower and wheat, the most negative impacts on yield and biomass production were observed with the combined scenarios of various temperature increases and precipitation decreases during each growing season at each location. According to the simulation results of the defined single and combined scenarios in both spatial areas, while the grain and biomass yields of the summer planted sunflower plant were negative linear relations every scenario, non-linear relations were determined in the yields of the winter-wheat plant. Finally, with the defined sensitivity scenarios, the correlation coefficients between biomass and grain yield of sunflower and winter wheat under similar climate but different soil types in two locations were found to be R2= 0.88 and 0.87 for KRK and R2 = 0.56, and 0.79, for EOR, respectively.
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