Fig. 5.

Weather data for two seasons of spring barley experiments. a Grey bars show the actual precipitation falling on the experiments, while white open bars in June and July indicate potential precipitation if rainout shelters had not been used. b Estimated reference evapotranspiration (Makkink–Hansen evapotranspiration estimates). a and b Solid bars show experimental data in both seasons, while boxplots relate to seasonal averages data from 1962 to 2008. Boxes show first quartile, median and third quartile. Extreme values are shown as points, while whiskers extend to the most extreme value within 1.5 × box length. c Lines represent daily air temperature as a 5-day moving average with the seasonal daily averages shown as a solid red line. d Daily soil temperature (0.5 m soil depth and 1.0 m soil depth)