Fig. 3.

Temporal trends in climate variables during the 2005-to-2018 period in three regions: Lower Niobrara, Tri-Basin, and Upper Big Blue. Only shown are trends that were statistically significant (P < 0.01). Lines represent the fitted linear-regression models. Also shown are slopes of the fitted linear-regression models for accumulated solar radiation (ARAD), average maximum temperature (Tmax), and minimum temperature (Tmin) computed for three crop phases: vegetative (V), flowering (F), and gran filling (G).