Table 3.
Cotton yields and yield components under different treatments during the 2018 and 2019 growing seasons.
| Treatment | 2018 | 2019 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Bolls no. | Boll weight | Seed cotton yield | Lint percentage | Lint yield | Bolls no. | Boll weight | Seed cotton yield | Lint percentage | Lint yield | |
| (m2) | (g) | (kg ha−1) | (%) | (kg ha−1) | (m2) | (g) | (kg ha−1) | (%) | (kg ha−1) | |
| Potassium fertilizer type | ||||||||||
| CRK | 81.26 a | 6.18 a | 5019.10 a | 45.66 a | 2291.75 a | 80.36 a | 6.04 a | 4940.04 a | 45.55 a | 2210.17 a |
| KS | 78.71 b | 5.97 b | 4699.05 b | 45.68 a | 2146.30 b | 77.73 b | 5.68 b | 4431.00 b | 45.58 a | 2013.39 b |
| FA rate (kg ha−1) | ||||||||||
| 90 | 78.98 b | 6.01 b | 4744.58 b | 45.59 a | 2163.07 b | 77.68 c | 5.76 b | 4475.20 c | 45.54 a | 2037.78 c |
| 180 | 81.48 a | 6.19 a | 5041.42 a | 45.67 a | 2302.52 a | 80.65 a | 5.98 a | 4824.09 a | 45.63 a | 2200.93 a |
| 270 | 79.48 b | 6.03 b | 4791.23 b | 45.74 a | 2191.48 b | 78.80 b | 5.84 b | 4605.83 b | 45.52 a | 2096.63 b |
| Potassium fertilizer type × FA rate interaction | ||||||||||
| Control | 71.52 e | 5.54 f | 3963.47 d | 45.59 a | 1807.12 d | 69.22 e | 5.21 d | 3609.66 e | 45.23 a | 1632.83 e |
| CRK × FA90 | 80.63 b | 6.06 cd | 4884.05 b | 45.57 a | 2225.78 b | 78.33 cd | 5.88 b | 4607.12 c | 45.53 a | 2097.92 c |
| CRK × FA180 | 82.96 a | 6.26 a | 5191.38 a | 45.75 a | 2375.10 a | 82.35 a | 6.17 a | 5080.23 a | 45.59 a | 2316.15 a |
| CRK × FA270 | 80.27 bc | 6.21 ab | 4981.89 b | 45.65 a | 2274.36 b | 80.42 b | 6.05 a | 4869.51 b | 45.51 a | 2216.43 b |
| KS × FA90 | 77.39 d | 5.95 de | 4605.12 c | 45.60 a | 2100.36 c | 77.03 d | 5.63 c | 4343.28 d | 45.53 a | 1977.64 d |
| KS × FA180 | 80.25 bc | 6.11 bc | 4891.46 b | 45.59 a | 2229.94 b | 78.96 c | 5.78 b | 4567.96 c | 45.66 a | 2085.70 c |
| KS × FA270 | 78.71 c | 5.84 e | 4600.56 c | 45.83 a | 2108.59 c | 77.24 d | 5.62 c | 4342.15 d | 45.54 a | 1976.83 d |
| Source of variance | ||||||||||
| Potassium fertilizer type | <0.0001 | <0.0001 | <0.0001 | 0.9059 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | 0.8307 | <0.0001 |
| FA rate | <0.0001 | 0.0017 | <0.0001 | 0.7298 | <0.0001 | 0.0009 | 0.0001 | <0.0001 | 0.7793 | <0.0001 |
| Potassium fertilizer type × FA rate | 0.0304 | 0.0111 | 0.2528 | 0.6701 | 0.4862 | 0.04679 | 0.0389 | 0.0163 | 0.9714 | 0.0085 |
Means followed by different lowercase letters in the same column were significantly different based on analyses by ANOVA followed by Duncan’s test (p < 0.05). Control, no potassium fertilizer; CRK, polymer-coated potassium chloride; and KS, sulfate potassium.