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Table 7 Yield and fiber quality characteristics of two cotton varieties’ (XLZ42 and XLZ45) in different treatment groups: Mulch film was removed at 1 and 10 days before the first irrigation (T1(June 4, 2015, June 19, 2016 and June 10, 2017), T10(May 25, 2015, June 9, 2016 and May 31, 2017), respectively) and 1 day before the second irrigation (E1(June 14, 2015, June 29, 2016 and June 20, 2017)) after seedling emergence, during 2015–2017. The control group (CK) was film mulched throughout the growth stage.

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

Varieties/Years

Treatments

Number of plants harvested

/(104 plants·hm−2)

Boll number on a single plant

Single boll weight

/g

Estimated yield of lint cotton

/(kg·hm−2)

UHML

/mm

Mic

Str

/(g·tex−1)

Elg

/%

SFI

/%

UI

/%

XLZ42, 2015

CK

20.87 ± 1.13a

5.54 ± 1.55a

5.17 ± 0.17a

1914.23 ± 734.23a

27.78 ± 0.94a

5.09 ± 0.07a

29.80 ± 2.00a

6.50 ± 0.14a

7.23 ± 0.41a

85.38 ± 1.29a

E1

19.61 ± 0.92a

5.00 ± 1.36ab

5.00 ± 0.48a

1 558.63 ± 239.84a

27.24 ± 0.73a

5.07 ± 0.13a

31.23 ± 1.50a

6.53 ± 0.10a

7.45 ± 0.66a

85.05 ± 1.23a

T1

18.79 ± 1.57a

4.92 ± 0.89ab

5.30 ± 0.37a

1715.35 ± 582.44a

26.76 ± 0.88a

5.10 ± 0.05a

29.55 ± 2.07a

6.40 ± 0.14a

7.40 ± 0.29a

85.15 ± 0.53a

T10

19.67 ± 1.55a

4.68 ± 0.96b

4.97 ± 0.39a

1 539.82 ± 528.93a

27.06 ± 0.66a

5.21 ± 0.16a

29.28 ± 1.58a

6.43 ± 0.17a

7.23 ± 0.43a

85.55 ± 1.02a

XLZ42, 2016

CK

12.14 ± 2.74a

6.76 ± 0.24a

5.93 ± 0.15a

1 585.55 ± 265.56a

28.15 ± 0.54a

4.30 ± 0.19a

28.83 ± 1.06ab

7.10 ± 0.10a

7.10 ± 0.00a

85.57 ± 0.15a

E1

12.20 ± 1.09a

7.24 ± 0.40a

6.03 ± 0.08a

1 631.69 ± 293.12a

27.86 ± 0.16a

4.31 ± 0.19a

27.67 ± 0.67b

7.03 ± 0.21a

7.40 ± 0.40a

85.00 ± 0.85a

T1

12.50 ± 0.61a

7.38 ± 1.24a

5.87 ± 0.28a

1 586.81 ± 163.05a

28.13 ± 0.11a

4.25 ± 0.27a

29.40 ± 1.40a

7.03 ± 0.06a

7.43 ± 0.32a

84.83 ± 0.74a

T10

11.13 ± 1.13a

7.05 ± 1.48a

5.98 ± 0.38a

1 609.93 ± 236.60a

28.30 ± 0.65a

4.57 ± 0.24a

28.90 ± 0.44ab

7.03 ± 0.15a

7.07 ± 0.15a

85.63 ± 0.40a

XLZ45, 2016

CK

11.44 ± 4.30a

8.13 ± 1.47a

6.35 ± 0.33a

1 558.84 ± 141.97a

29.85 ± 0.38a

3.92 ± 0.20a

30.77 ± 0.45a

7.53 ± 0.21a

6.83 ± 0.06a

86.20 ± 0.89a

E1

14.03 ± 1.60a

7.82 ± 2.25a

5.98 ± 0.14a

1 484.72 ± 171.66a

29.58 ± 0.57a

3.91 ± 0.23a

30.57 ± 1.33a

7.53 ± 0.15a

7.00 ± 0.26a

85.47 ± 0.67a

T1

14.22 ± 0.53a

6.43 ± 0.49a

6.13 ± 0.47a

1 609.83 ± 206.19a

30.04 ± 0.67a

3.76 ± 0.44a

31.33 ± 1.20a

7.70 ± 0.00a

6.83 ± 0.15a

86.17 ± 0.55a

T10

11.42 ± 3.26a

7.45 ± 1.32a

6.21 ± 0.41a

1 602.97 ± 208.30a

29.61 ± 0.06a

3.99 ± 0.15a

31.00 ± 0.30a

7.50 ± 0.10a

7.27 ± 0.32a

84.60 ± 1.04a

XLZ42, 2017

CK

14.23 ± 1.03a

8.83 ± 1.65a

4.77 ± 0.19a

2014.12 ± 200.67ab

27.84 ± 0.63a

4.42 ± 0.28a

29.53 ± 1.21a

6.80 ± 0.10a

7.03 ± 0.49a

86.13 ± 1.25a

E1

14.86 ± 0.71a

9.43 ± 1.59a

5.04 ± 0.36a

2 257.29 ± 248.48a

27.43 ± 0.15a

4.36 ± 0.14a

28.57 ± 0.32a

6.77 ± 0.06a

7.37 ± 0.15a

85.10 ± 0.26a

T1

13.74 ± 1.19a

8.40 ± 0.79a

4.98 ± 0.30a

2056.67 ± 22.40ab

28.53 ± 0.37a

4.41 ± 0.30a

30.27 ± 0.85a

6.90 ± 0.00a

7.30 ± 0.30a

85.03 ± 0.76a

T10

14.67 ± 1.40a

8.37 ± 2.06a

4.63 ± 0.16a

1869.94 ± 155.84b

26.53 ± 0.64a

4.39 ± 0.10a

28.80 ± 1.25a

6.73 ± 0.12a

7.67 ± 0.91a

84.80 ± 1.25a

XLZ45, 2017

CK

15.75 ± 0.64a

9.43 ± 0.59a

5.36 ± 0.15a

2 177.05 ± 166.17a

27.47 ± 1.01a

4.27 ± 0.07a

29.57 ± 0.70a

6.83 ± 0.15a

7.73 ± 1.07a

84.80 ± 1.90a

E1

14.63 ± 0.64a

9.53 ± 0.95a

5.03 ± 0.26a

2 243.54 ± 389.42a

27.20 ± 1.11a

4.41 ± 0.30a

28.80 ± 2.77a

6.70 ± 0.10a

7.57 ± 0.65a

84.90 ± 1.08a

T1

15.13 ± 0.62a

7.93 ± 0.87a

4.99 ± 0.31a

2 137.70 ± 271.74a

27.39 ± 0.35a

4.45 ± 0.25a

29.33 ± 0.95a

6.77 ± 0.15a

7.80 ± 0.70a

84.33 ± 1.17a

T10

14.92 ± 0.15a

7.73 ± 0.51a

5.07 ± 0.28a

2 154.97 ± 175.75a

29.09 ± 0.53a

4.52 ± 0.06a

31.93 ± 0.83a

6.97 ± 0.06a

7.00 ± 0.10a

85.63 ± 0.25a

  1. Note: Values are means ± SD (n = 3). Within a column, values with different lowercase letters are significantly different at the P < 0.05 level according to LSD among treatment groups in the same year; different capital letters indicate significant difference at the P < 0.01 level according to LSD among treatment groups in the same year
  2. UHML Upper-half mean length, Mic Micronaire reading, Str Specific breaking strength, Elg Elongation percentage, SFI Short fiber index, UI Uniformity index