Table 2.
Effect of different application rates of biochar on the agronomic traits of the flue-cured tobacco plants.
| Experimental site | Days after transplantation | Treatments | Plant height (cm) | Stem circumference (cm) | Number of effective leaves | Maximum leaf length (cm) | Maximum leaf width (cm) | Maximum leaf area (cm2) |
|---|---|---|---|---|---|---|---|---|
| Chuxiong | 35 | CK | 18.33±0.29a | 5.63±0.81a | 11.67±0.58a | 35.57±2.23a | 17.50±1.76a | 396.57±63.99a |
| T1 | 14.60±0.66b | 4.60±0.60a | 11.00±1.00ab | 30.07±0.93ab | 15.70±0.82a | 299.61±20.71ab | ||
| T2 | 14.33±0.58b | 5.17±0.21a | 11.33±0.58ab | 33.83±1.70bc | 16.53±2.21a | 356.12±60.84ab | ||
| T3 | 14.00±0.50b | 5.00±0.87a | 11.33±0.58ab | 31.40±1.82bc | 15.17±0.61a | 302.55±28.49ab | ||
| T4 | 12.27±1.17c | 4.53±0.31a | 10.00±1.00b | 30.70±2.79c | 14.60±2.54a | 286.80±72.63b | ||
| 60 | CK | 93.00±1.00ab | 7.33±0.28a | 19.00±1.00ab | 60.33±2.52c | 29.00±1.00ab | 1109.74±46.90bc | |
| T1 | 96.33±2.52a | 7.77±0.68a | 20.00±2.65a | 69.33±2.08a | 32.33±4.04a | 1421.07±169.51a | ||
| T2 | 94.00±2.00ab | 7.70±0.82a | 19.68±2.08ab | 66.33±2.52ab | 28.67±5.51ab | T3.69±187.24ab | ||
| T3 | 89.00±2.65b | 7.90±0.36a | 18.67±2.52ab | 61.33±4.73bc | 30.67±2.89ab | 1197.30±188.81ab | ||
| T4 | 79.33±4.93c | 7.70±0.26a | 16.33±1.15b | 54.33±1.15d | 24.67±1.15b | 850.65±51.40c | ||
| 85 | CK | 110.00±3.00bc | 9.10±0.37a | 21±0.84ab | 71.67±1.53b | 28.67±1.53b | 1303.05±61.35bc | |
| T1 | 119.33±4.16a | 9.50±0.50a | 21.87±0.75a | 75.50±0.5a | 34.63±2.47a | 1659.42±124.88a | ||
| T2 | 114.83±2.84ab | 9.37±1.01a | 21.4±0.69a | 73.83±1.04ab | 32.73±3.16a | 1534.82±169.56ab | ||
| T3 | 107.33±2.52cd | 8.83±0.29a | 19.73±0.64bc | 66.93±1.91c | 27.53±2.36b | 1167.58±71.11cd | ||
| T4 | 103.33±1.53d | 8.5±0.50a | 18.57±0.74c | 64.50±1.8d | 25.00±1.00b | 1023.34±56.69d | ||
| Qujing | 35 | CK | 17.97±0.65a | 6.93±0.42a | 13.78±1.34a | 41.43±0.49a | 17.66±1.89a | 464.20±50.01a |
| T1 | 17.80±1.79a | 7.67±0.79a | 13.55±0.84a | 41.76±0.32a | 17.50±1.05a | 463.59±28.79a | ||
| T2 | 17.70±0.36a | 7.39±0.30a | 13.22±1.02a | 41.21±2.17a | 17.18±1.23a | 449.84±49.95a | ||
| T2 | 17.13±0.97a | 6.75±0.42a | 12.44±0.51a | 41.56±0.96a | 18.20±1.37a | 479.89±37.34a | ||
| T3 | 15.73±0.21b | 6.74±0.89a | 11.56±0.77a | 40.19±1.04a | 16.86±1.47a | 429.31±26.56a | ||
| 60 | CK | 106.67±2.89b | 11.63±0.78ab | 22.67±2.31a | 82.67±1.53b | 32.67±3.21ab | 1713.36±171.65ab | |
| T1 | 119.33±3.51a | 12.83±0.29a | 23.33±1.53a | 86.67±1.53a | 35.00±3.00a | 1923.38±144.00a | ||
| T2 | 111.67±5.69ab | 11.17±0.76b | 23.00±4.36a | 83.73±1.10ab | 32.65±1.53ab | 1734.85±59.65ab | ||
| T3 | 98.33±2.52c | 11.97±0.95ab | 22.33±4.00a | 83.00±2.65b | 29.34±2.52b | 1542.05±84.13b | ||
| T4 | 96.33±5.86c | 11.37±0.55b | 22.00±5.20a | 82.00±3.00b | 29.33±3.79b | 1525.55±197.6b | ||
| 85 | CK | 125.33±8.74b | 12.93±1.01a | 23.00±1.00a | 85.20±2.03a | 33.83±1.61a | 1828.99±97.58a | |
| T1 | 142.00±6.00a | 13.47±1.00a | 24.00±1.00a | 90.67±3.62a | 36.17±3.55a | 2085.02±274.58a | ||
| T2 | 134.00±2.00a | 12.80±0.53a | 23.67±1.53a | 90.17±4.01a | 34.70±2.31a | 1989.09±219.77a | ||
| T3 | 119.00±5.00c | 13.37±1.00a | 23.33±1.15a | 86.00±4.77a | 33.60±2.01a | 1836.89±199.93a | ||
| T4 | 111.17±8.13c | 12.53±0.85a | 22.50±0.50a | 84.43±2.00a | 32.20±2.55a | 1726.24±161.11a |
Here: CK, T1, T2, T3, and T4 represent 0, 600, 900, 1200, and 1800 kg/ha application of biochar, respectively. The significant difference among treatments after specific days of post-transplantation is shown by different lowercase letters within a column according to the least significant difference test (LSD; p< 0.05).