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Table 1 Soil average temperature, accumulated temperature, average temperature difference, and accumulated temperature difference 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 growth stages (CK) for three soil depth layers (10, 20, and 30 cm) during 2015–2016

From: Photosynthetic characteristics of cotton are enhanced by altering the timing of mulch film removal

Item

Year

Soil layer depth

/cm

CK

T1

E1

T10

Air Temperature

/°C

Average temperature

/°C

2015

10

23.56

23.08

22.27

23.48

23.54

 

20

23.68

22.87

22.49

23.06

 
 

30

22.34

22.69

22.26

22.54

 

2016

10

22.99

21.95

21.32

23.31

24.03

 

20

23.00

21.72

21.24

22.93

 
 

30

22.70

21.60

21.09

22.55

 

Accumulated temperature

/°C

2015

10

2 572.90

2 562.80

2 535.62

2 563.53

2 571.68

 

20

2 587.03

2 529.05

2 536.32

2 517.27

 
 

30

2 439.18

2 491.04

2 472.97

2 459.96

 

2016

10

2 587.76

2 570.10

2 547.73

2 625.77

2 703.08

 

20

2 588.33

2 536.72

2 532.49

2 582.41

 
 

30

2 554.44

2 509.85

2 501.04

2 541.30

 

Average temperature

difference

/°C

2015

10

9.79

6.46

6.18

8.38

13.34

 

20

5.58

4.59

4.22

5.28

 
 

30

2.45

2.30

2.22

2.45

 

2016

10

3.76

2.83

2.94

5.78

13.33

 

20

2.85

1.56

1.74

2.33

 
 

30

1.28

0.84

0.81

0.85

 

Accumulated temperature

difference

/°C

2015

10

1 068.56

749.50

824.28

912.97

1 452.60

 

20

609.13

524.83

538.85

571.94

 
 

30

265.95

265.55

271.44

265.98

 

2016

10

419.60

378.80

430.62

655.84

1 514.70

 

20

319.50

217.42

264.24

258.89

 
 

30

144.81

114.12

124.48

96.89

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