Table 2 Fiber quality characteristics of irrigation treatments (FI, HI, and RF) on cotton in a Dundee silt loam with single-row (SR) and twin-row (TR) planting geometries estimated by high volume instrument (HVI). FI is full irrigation; HI is half irrigation; RF is rain-fed
Treatment | Planting geometry | Micronaire (MIC) | Uniformity/ % | Upper half mean length (UHML) /mm | Strength / (kN·m·kg−1) | ||||||||
2018 | 2019 | Mean | 2018 | 2019 | Mean | 2018 | 2019 | Mean | 2018 | 2019 | Mean | ||
FI | SR | 4.26 d | 3.95 d | 4.11 d | 82.65 c | 82.85 bc | 82.8 b | 1.36 a | 1.34 ab | 1.35 a | 31.18 a | 31.85 a | 31.5 a |
TR | 4.29 d | 4.51 b | 4.40 b | 83.37 a | 83.03 bc | 83.2 b | 1.35 a | 1.30 c | 1.33 b | 31.92 a | 32.15 a | 32.0 a | |
HI | SR | 4.21 d | 4.26 c | 4.24 c | 84.80 a | 83.87 ab | 84.3 a | 1.35 a | 1.31 bc | 1.33 b | 31.22 a | 32.73 a | 32.0 a |
TR | 4.45 c | 4.37 b | 4.41 b | 84.58 a | 83.73 ab | 84.2 a | 1.36 a | 1.30 bc | 1.33 b | 30.45 ab | 30.51 ab | 30.5 b | |
RF | SR | 4.65 b | 4.78 a | 4.72 a | 80.58 d | 81.29 d | 80.9 c | 1.22 d | 1.20 d | 1.21 c | 30.56 ab | 29.90 b | 30.2 c |
TR | 4.91 a | 4.82 a | 4.87 a | 81.10 d | 81.00 d | 81.0 c | 1.21 d | 1.24 d | 1.23 c | 28.70 b | 29.24 b | 29.0 c | |
Treatment | Planting geometry | Reflectance (Rd) | Yellowness (+b) | Trash / % | |||||||||
2018 | 2019 | Mean | 2018 | 2019 | Mean | 2018 | 2019 | Mean | |||||
FI | SR | 77.90 | 74.32 | 76.1 | 5.74 | 5.38 | 5.6 | 142.25 a | 233.40 b | 187.8 a | |||
TR | 77.83 | 73.97 | 75.9 | 6.43 | 5.34 | 6.5 | 112.54 a | 248 b | 180.3 a | ||||
HI | SR | 78.50 | 74.45 | 76.5 | 6.47 | 5.75 | 5.5 | 121.16 a | 216.02 b | 168.6 b | |||
TR | 78.63 | 72.86 | 75.7 | 6.05 | 5.95 | 6.0 | 122.5 a | 217.12 b | 169.8 b | ||||
RF | SR | 78.41 | 74.18 | 76.3 | 6.03 | 6.01 | 6.0 | 130.21 a | 209.41 b | 169.8 b | |||
TR | 77.43 | 72.85 | 75.1 | 6.12 | 5.76 | 6.1 | 155.24 a | 204.95 b | 180.1 a | ||||