Classification | Grade | Maturity | Structure | Thickness | Oil content | Chroma | Length (cm) | Mutilation (%) | Price (RMB kg−1) |
---|---|---|---|---|---|---|---|---|---|
Superior | B1F | Maturity | Slight loose | Slight thick | Many | Very strong | 45 | 15 | 41.4 |
B2F | Maturity | Slight loose | Slight thick | Medium | Strong | 40 | 20 | 34.0 | |
C1F | Maturity | Loose | Medium | Many | Very strong | 45 | 10 | 48.5 | |
C2F | Maturity | Loose | Medium | Medium | Strong | 40 | 15 | 43.8 | |
C3F | Maturity | Loose | Medium | Medium | Medium | 35 | 25 | 38.8 | |
Medium | B3F | Maturity | Slight dense | Slight thick | Medium | Medium | 35 | 30 | 22.0 |
X2F | Maturity | Loose | Slight thin | Less | Medium | 35 | 25 | 22.9 | |
X3F | Maturity | Loose | Slight thin | Less | Weak | 30 | 30 | 11.9 | |
X2V | Slight maturity | Loose | Slight thin | Less | Medium | 35 | 15 | 8.6 | |
Inferior | CX1K | Slight maturity | Loose | Slight thin | Medium | — | 35 | 20 | 5.8 |
N rate (kg N ha−1) | Nicotine (%) | Total N (%) | Reducing sugar (%) | Total sugar (%) | K (%) | Cl (%) | Total sugar / nicotine | Total N / nicotine | K / Cl |
---|---|---|---|---|---|---|---|---|---|
0 | 1.40 ± 0.04 | 1.44 ± 0.01 | 21.5 ± 0.06 | 36.0 ± 0.79 | 1.43 ± 0.02 | 0.44 ± 0.04 | 30.1 ± 2.12 | 1.31 ± 0.09 | 3.43 ± 0.40 |
45 | 1.42 ± 0.03 | 1.51 ± 0.03 | 22.2 ± 0.47 | 36.7 ± 1.34 | 1.40 ± 0.02 | 0.47 ± 0.08 | 26.2 ± 0.72 | 1.22 ± 0.07 | 4.43 ± 0.38 |
60 | 1.56 ± 0.05 | 1.56 ± 0.02 | 19.8 ± 0.59 | 34.0 ± 0.91 | 1.66 ± 0.13 | 0.39 ± 0.02 | 22.2 ± 2.11 | 1.08 ± 0.06 | 4.72 ± 1.37 |
75 | 2.49 ± 0.07 | 2.20 ± 0.07 | 18.6 ± 0.94 | 28.1 ± 1.17 | 1.48 ± 0.07 | 0.42 ± 0.06 | 16.4 ± 0.33 | 0.79 ± 0.02 | 3.04 ± 0.06 |
90 | 2.38 ± 0.05 | 1.91 ± 0.08 | 20.6 ± 0.70 | 31.8 ± 0.96 | 1.40 ± 0.03 | 0.35 ± 0.04 | 12.2 ± 0.11 | 0.82 ± 0.03 | 4.42 ± 0.18 |
105 | 2.08 ± 0.04 | 1.72 ± 0.02 | 19.2 ± 0.08 | 31.2 ± 0.42 | 1.46 ± 0.02 | 0.37 ± 0.03 | 15.1 ± 0.77 | 0.82 ± 0.02 | 3.57 ± 0.34 |
LSD0.05 | 0.28 | 0.23 | 2.84 | 5.59 | 0.29 | 0.27 | 6.16 | 0.31 | 2.73 |
Best range | 2.20–2.80 | 2.00–2.50 | 18.0–22.0 | 26.0–30.0 | ≥ 2.50 | c 0.60 | 8.50–9.50 | 0.95–1.05 | ≥ 8.00 |
Compound | Grading rules | ||||
---|---|---|---|---|---|
100 | 100–90 | 90–80 | 80–70 | 70–60 | |
Nicotine (%) (B1) | 2.20–2.80 | 2.20–2.00 | 2.00–1.80 | 1.80–1.70 | 1.70–1.60 |
2.80–2.90 | 2.90–3.00 | 3.00–3.10 | 3.10–3.20 | ||
Total N (%) (B2) | 2.00–2.50 | 2.00–1.90 | 1.90–1.80 | 1.80–1.70 | 1.70–1.60 |
2.50–2.60 | 2.60–2.70 | 2.70–2.80 | 2.80–2.90 | ||
Reducing sugar (%) (B3) | 18.0–22.0 | 18.0–16.0 | 16.0–14.0 | 14.0–13.0 | 13.0–12.0 |
22.0–24.0 | 24.0–26.0 | 26.0–27.0 | 27.0–28.0 | ||
K (%) (B4) | ≥ 2.50 | 2.50–2.00 | 2.00–1.50 | 1.50–1.20 | 1.20–1.00 |
Total sugar / Nicotine (B5) | 8.50–9.50 | 8.50–7.00 | 7.00–6.00 | 6.00–5.50 | 5.50–5.00 |
9.50–12.0 | 12.0–13.0 | 13.0–14.0 | 14.0–15.0 | ||
Total N / Nicotine (B6) | 0.95–1.05 | 0.95–0.80 | 0.80–0.70 | 0.70–0.65 | 0.65–0.60 |
1.05–1.20 | 1.20–1.30 | 1.30–1.35 | 1.35–1.40 | ||
K/Cl (B7) | ≥ 8.00 | 8.00–6.00 | 6.00–5.00 | 5.00–4.50 | 4.50–4.00 |
Integrated grade (IG) | IG = B1 × 0.18 + B2 × 0.10 + B3 × 0.15 + B4 × 0.09 + B5 × 0.26 + B6 × 0.12 + B7 × 0.10 |
Time | N rate | Inorganic N | NH4+ –N | NO3− –N |
---|---|---|---|---|
BefTrp (April 22, 2021) | 32.0 ± 2.20 | 1.45 ± 0.65 | 30.5 ± 2.69 | |
AftHarv (August 31, 2021) | 0 | 23.3 ± 1.37 | 0.98 ± 0.12 | 22.4 ± 1.49 |
45 | 25.9 ± 0.07 | 1.00 ± 0.05 | 24.9 ± 0.12 | |
60 | 28.1 ± 0.85 | 1.01 ± 0.11 | 27.0 ± 0.82 | |
75 | 31.7 ± 1.27 | 1.03 ± 0.04 | 30.7 ± 1.24 | |
90 | 34.8 ± 0.83 | 1.33 ± 0.26 | 33.5 ± 0.60 | |
105 | 47.4 ± 4.22 | 1.13 ± 0.16 | 46.3 ± 4.36 | |
BefTrp (April 25, 2022) | 0 | 27.0 ± 3.13 | 9.81 ± 0.45 | 17.2 ± 2.93 |
45 | 45.7 ± 7.79 | 8.12 ± 0.24 | 37.6 ± 7.72 | |
60 | 54.5 ± 5.41 | 8.19 ± 0.21 | 46.3 ± 5.21 | |
75 | 70.6 ± 8.21 | 9.71 ± 0.33 | 60.8 ± 7.90 | |
90 | 73.3 ± 10.4 | 9.21 ± 1.54 | 64.1 ± 10.0 | |
105 | 80.7 ± 1.14 | 9.79 ± 1.09 | 70.9 ± 2.23 | |
AftHarv (September 05, 2022) | 0 | 21.0 ± 6.65 | 2.58 ± 0.40 | 18.5 ± 6.57 |
45 | 56.2 ± 7.92 | 7.75 ± 0.42 | 48.4 ± 7.82 | |
60 | 62.9 ± 8.98 | 12.1 ± 2.71 | 50.8 ± 7.35 | |
75 | 76.3 ± 9.50 | 6.80 ± 0.29 | 69.5 ± 9.23 | |
90 | 90.4 ± 9.17 | 7.04 ± 1.54 | 83.4 ± 7.92 | |
105 | 97.7 ± 7.66 | 7.29 ± 2.40 | 90.4 ± 7.12 |
Precipitation (mm) | Temperature (°C ) | Sunshine duration (h) | |||||||
---|---|---|---|---|---|---|---|---|---|
Month | 1981–2020 | 2021 | 2022 | 1981–2020 | 2021 | 2022 | 1981–2020 | 2021 | 2022 |
April | 28.0 | 64.5 | 35.6 | 18.2 | 19.2 | 16.7 | 223 | 231 | 227 |
May | 80.1 | 22.5 | 69.8 | 20.3 | 21.8 | 18.3 | 208 | 229 | 219 |
June | 152 | 166 | 43.8 | 21.2 | 21.9 | 21.1 | 131 | 129 | 130 |
July | 210 | 107 | 27.6 | 21.2 | 21.5 | 22.6 | 116 | 96 | 106 |
August | 162 | 199 | 95.4 | 21.4 | 21.5 | 22.4 | 149 | 124 | 137 |
Average | 126 | 112 | 54.4 | 20.5 | 21.2 | 20.2 | 165 | 162 | 164 |
Max | 268 | 199 | 95.4 | 31.8 | 33.1 | 31.1 | 241 | 231 | 227 |
Min | 16.0 | 22.5 | 27.6 | 9.4 | 8.8 | 3.8 | 89 | 96 | 106 |
Recommend N rate | |||
---|---|---|---|
Soil N min (kg N ha−1) | Total (kg N ha−1) | Base fertilizer (kg N ha−1) | Top application (kg N ha−1) |
20 | 110 | 44 | 66 |
30 | 100 | 40 | 60 |
40 | 90 | 36 | 54 |
50 | 80 | 32 | 48 |
60 | 70 | 28 | 42 |
70 | 60 | 24 | 36 |
80 | 50 | 15 | 35 |
90 | 40 | 5 | 35 |
100 | 30 | 0 | 30 |