Table 3. Chlorophyll fluorescence of noodle rice as influenced by of different biochar levels under low and high N rates.
| Treatment | F0 | FV/Fm | φPS2 | ETR | ||||
|---|---|---|---|---|---|---|---|---|
| S1 | S2 | S1 | S2 | S1 | S2 | S1 | S2 | |
| Till | ||||||||
| N1C | 97.33a | 96.50a | 0.716d | 0.7725c | 0.23d | 0.17c | 96.49c | 69.64e |
| N2C | 80.33bc | 89.28ab | 0.773c | 0.8473a | 0.22bcd | 0.27bc | 94.49c | 111.59d |
| N1B1 | 73.67c | 87.48ab | 0.736cd | 0.7804bc | 0.24bcd | 0.26bc | 100.98bc | 107.43cd |
| N1B2 | 77bc | 90.58a | 0.836ab | 0.8429a | 0.30abc | 0.29ab | 127.71b | 122.85 |
| N1B3 | 83.67a | 81.54ab | 0.869a | 0.8662a | 0.36a | 0.33ab | 152.24a | 139.50bc |
| N2B1 | 84.67b | 89.19ab | 0.826b | 0.8246ab | 0.31ab | 0.29ab | 131.84ab | 121.29b |
| N2B2 | 77.33bc | 88.18ab | 0.848ab | 0.8578a | 0.36a | 0.37a | 150.08a | 156.24a |
| N2B3 | 81.33a | 84.88b | 0.863ab | 0.8562a | 0.39a | 0.35ab | 162.10a | 147.36ab |
| Head | ||||||||
| N1C | 97.59a | 90.59a | 0.779c | 0.794c | 0.19c | 0.16d | 78.4c | 69.25d |
| N2C | 93.95ab | 86.95b | 0.765c | 0.782c | 0.25abc | 0.22cd | 105.6 | 90.34cd |
| N1B1 | 87.93ab | 80.93bc | 0.791bc | 0.807bc | 0.23abc | 0.23cd | 96.5abc | 96.52bc |
| N1B2 | 87.92abc | 80.92bc | 0.849a | 0.861a | 0.28abc | 0.29bc | 117.5abc | 120.67ab |
| N1B3 | 82.54c | 75.54b | 0.869a | 0.880a | 0.30abc | 0.34a | 127.2abc | 142.28a |
| N2B1 | 89.25ab | 82.25bc | 0.831ab | 0.844ab | 0.21bc | 0.30ab | 86.5bc | 125.62ab |
| N2B2 | 82.62b | 75.62bc | 0.861a | 0.872a | 0.36z | 0.34a | 150.9a | 141.37a |
| N2B3 | 85.59bc | 78.59c | 0.863a | 0.874a | 0.33ab | 0.37a | 139.5ab | 154.08a |
| Mat | ||||||||
| N1C | 94.59a | 86.9a | 0.785bc | 0.794c | 0.14e | 0.18bc | 56.80e | 73.83bc |
| N2C | 90.95ab | 89.28a | 0.767c | 0.847ab | 0.18de | 0.27ab | 75.76de | 111.59ab |
| N1B1 | 93.59a | 78.91ab | 0.867a | 0.881a | 0.20cde | 0.27ab | 82.32cde | 112.91ab |
| N1B2 | 79.54c | 75.62c | 0.862a | 0.877a | 0.29ab | 0.30ab | 122.61ab | 124.89ab |
| N1B3 | 85.96abc | 78.59ab | 0.846ab | 0.876a | 0.25bcd | 0.11c | 103.86bcd | 46.97c |
| N2B1 | 86.25abc | 89.19a | 0.824abc | 0.824bc | 0.26abc | 0.29ab | 110.44abc | 121.29ab |
| N2B2 | 82.59bc | 88.18a | 0.867a | 0.857ab | 0.33a | 0.37a | 138.92a | 156.24a |
| N2B3 | 79.62c | 84.88ab | 0.831ab | 0.856ab | 0.29ab | 0.35a | 123.85ab | 147.36a |
| SOV | F0 | FV/Fm | φPS2 | ETR | ||||
| Biochar (B) | ** | ** | ** | ** | ||||
| Nitrogen(N) | ns | ** | ** | * | ||||
| Season(S) | * | ns | ns | ns | ||||
| BxN | ** | ns | ** | ** | ||||
| BxS | ns | ns | ns | ns | ||||
| NxS | ns | ns | ns | ns | ||||
| BxNxS | ns | ns | ns | ns | ||||
Notes.
- F0
- minimal fluorescence
- Fv/Fm
- Maximum fluorescence
φPS2-ETR-electron transport rate, N 1C–N; lower dose + Control (no biochar), N 2C–N; higher dose + Control (no biochar), N 1B1–N; lower dose + Biochar 20 t ha −1, N1B2–N; lower dose + Biochar 40 t ha−1, N1B3–N; lower dose + Biochar 60 t ha−1, N2B 1–N; higher dose + Biochar 20 t ha−1, N2B2–N; higher dose + biochar 40 t ha −1, N2B3–N; higher dose + Biochar 60 t ha−1, Values followed by the same letters, within column, are not significantly different at P ≤ 0.05. SOV-source of variation, ** indicate the significant difference P ≥ 0.01 and * indicate P = 0.01 − 0.05, Data were averaged year wise and analyzed.