FIGURE 2.

Winter wheat plant water content (PWC) at different growth stages in 2014–2015 (A) and 2015–2016 (B). Vertical bars represent the standard deviation (SD) of PWC. W₁, W₂, W₃, W₄, and W₅ represent the irrigation upper limits which were 80, 60, 45, 35, and less than 30% of the field capacity, respectively. I₁ represents four irrigations at jointing, booting, flowering, and filling stage. I₂ demonstrates three irrigations at jointing, booting, and filling stage. I₃ shows two irrigations at jointing and flowering stage. I₄ represents two irrigations at jointing and filling stage. I₅ is the treatment without irrigation.