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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