Fig. 2
From: Photosynthetic characteristics of cotton are enhanced by altering the timing of mulch film removal
Daily average soil temperature (°C) variation in various treatment groups: 1 and 10 days before the first irrigation (T1, T10, respectively) and 1 day before the second irrigation (E1) after seedling emergence, with one control group of film mulching present across cotton plant growth stages (CK) and soil depth layers (10, 20, and 30 cm) across growth stages during 2015–2016. AT is air temperature. A and D represent the removal of mulch 10 days before the first irrigation on May 25, 2015 and June 9, 2016, respectively. B and E represent the removal of mulching film on June 4, 2015 and June 19, 2016, respectively, one day before the first irrigation. C and F represent the removal of mulching film on June 14, 2015 and June 29, 2016, respectively, one day before the second irrigation