Fig. 4
From: Photosynthetic characteristics of cotton are enhanced by altering the timing of mulch film removal
Gas exchange parameters of cotton varieties (XLZ42 and XLZ45) at different days since flowering in various treatment groups: 1 (T1) and 10 days (T10) before the first irrigation, respectively, and 1 day before the second irrigation (E1) after seedling emergence during 2016–2017. The control group (CK) had film mulching throughout the growth stages. Bars are means ± standard deviation (n = 3). Pn, photosynthetic rate; Cond, conductance to H2O; Ci, intercellular CO2 concentration; Ls, stoma limit value