Table 3.
Effect of different slow-release N fertilizers and N increments on morphological and yield attributes of a cotton crop
| Treatments | Plant height (cm) | Leaf area index (LAI) |
CGR g m2day-1) |
Seed cotton yield (kg ha-1) |
Biological yield (kg ha-1) | N use efficiency (kg SCY/kg N) |
|---|---|---|---|---|---|---|
| Simple urea | ||||||
| N1=160 kg ha-1 | 143 b | 3.73 a | 3.96 a | 4254 b | 10107 b | 26.6 f |
| N2= 120 kg ha-1 | 117 cd | 3.04 c | 3.24 c | 3521 d | 8292 cd | 29.3 e |
| N3= 80 kg ha-1 | 103 g | 2.43 g | 2.62 f | 2823 e | 7126 g | 35.3 c |
| Neem-coated urea | ||||||
| N1=160 kg ha-1 | 143 b | 3.73 a | 3.94 a | 4247 b | 10133 b | 26.5 f |
| N2= 120 kg ha-1 | 120 c | 3.29 b | 3.56 b | 3827 c | 8517 c | 31.9 d |
| N3= 80 kg ha-1 | 102 fg | 2.67 ef | 2.80 ef | 3017 e | 7195 fg | 37.7 ab |
| Sulfur-coated urea | ||||||
| N1=160 kg ha-1 | 143 b | 3.75 a | 3.95 a | 4246 b | 10109 b | 26.5 f |
| N2= 120 kg ha-1 | 111 e | 2.91 cd | 3.07 cd | 3307 d | 7854 e | 27.6 ef |
| N3= 80 kg ha-1 | 99 g | 2.48 g | 2.61 f | 2810 e | 7035 g | 35.1 c |
| Bacterial coated urea | ||||||
| N1=160 kg ha-1 | 150 a | 3.90 a | 4.15 a | 4652 a | 10613 a | 27.9 ef |
| N2= 120 kg ha-1 | 143 b | 3.77 a | 4.01 a | 4513 a | 10261 b | 35.9 bc |
| N3= 80 kg ha-1 | 106 f | 2.78 de | 2.94 de | 3369 d | 7487 f | 39.6 a |
| Loaded biochar | ||||||
| N1=160 kg ha-1 | 143 b | 3.74 a | 3.94 a | 4254 b | 10114 b | 26.6 f |
| N2= 120 kg ha-1 | 113 de | 2.97 c | 3.13 cd | 3366 d | 8004 de | 28.0 ef |
| N3= 80 kg ha-1 | 101 g | 2.49 fg | 2.64 f | 2840 e | 7150 g | 35.5 c |
| SRF | ** | ** | ** | ** | ** | |
| NI | ** | ** | ** | ** | ** | |
| SRF × NI | ** | ** | ** | ** | ** |