Table 5. The Percentage Deviations (±) of the Calculated Values of Photosynthetic Responses by the Skewed and Gaussian Models for Different Leaf Positions under Control Conditions (95–90% FC) with PSAP Application in Sugarcane Plants.
| Skewed
model |
Gaussian
model |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSAP
(M) |
PSAP
(M) |
|||||||||||
| leaf position | 0 | 2 | 4 | 6 | 10 | average | 0 | 2 | 4 | 6 | 10 | average |
| PN (μmol CO2 m–2 s–1) | ||||||||||||
| 1 | –2.17 | –0.63 | –0.21 | –1.71 | –0.99 | 1.142 | –2.08 | –1.45 | –0.29 | –0.07 | –0.07 | 0.792 |
| 2 | +2.47 | +0.09 | +0.13 | +1.95 | +2.16 | 1.36 | +4.09 | +1.92 | +0.46 | +1.24 | +1.11 | 1.764 |
| 3 | +0.19 | +0.85 | +0.43 | –0.50 | –1.84 | 0.762 | –0.33 | +1.41 | +0.30 | –3.01 | –2.47 | 1.504 |
| 4 | –1.30 | –0.15 | –0.97 | +0.78 | 0.8 | –3.22 | –1.90 | –1.20 | +1.76 | +0.62 | 1.74 | |
| 5 | +1.34 | –0.46 | +0.85 | –0.92 | +1.71 | 1.056 | +0.06 | –2.82 | +0.75 | +1.56 | +2.66 | 1.57 |
| 6 | –0.58 | +0.30 | –0.31 | +0.36 | –1.04 | 0.518 | +2.32 | +3.47 | –0.12 | –1.55 | –1.87 | 1.866 |
| average | 1.342 | 0.413 | 0.483 | 1.037 | 1.29 | 0.913 | 2.017 | 2.162 | 0.52 | 1.532 | 1.467 | 1.539 |
| gs (mmol H2O m–2 s–1) | ||||||||||||
| 1 | –0.92 | –1.36 | –1.06 | –0.94 | –0.24 | 0.904 | –0.79 | –3.33 | –3.47 | –1.97 | –1.76 | 2.264 |
| 2 | +1.77 | +6.33 | +3.99 | +3.17 | +0.43 | 3.318 | +1.37 | +7.99 | +6.26 | +4.17 | +2.52 | 4.462 |
| 3 | –0.08 | –4.56 | –0.41 | –1.46 | +1.86 | 1.674 | –0.03 | –2.33 | +2.47 | –0.02 | +3.20 | 1.61 |
| 4 | +1.76 | –0.21 | –3.15 | –2.80 | –2.30 | 2.044 | +2.10 | +1.17 | –1.67 | –2.02 | –2.98 | 1.988 |
| 5 | –6.77 | –6.39 | –6.07 | –0.86 | –2.87 | 4.592 | –6.61 | –7.02 | –7.04 | –1.41 | –4.55 | 5.326 |
| 6 | +2.78 | +8.29 | +8.63 | +4.28 | +3.59 | 5.514 | +5.09 | +4.58 | +4.00 | +1.00 | +4.01 | 3.736 |
| average | 2.347 | 4.523 | 3.885 | 2.252 | 1.882 | 2.978 | 2.665 | 4.403 | 4.152 | 1.765 | 3.17 | 3.231 |
| E (mmol H2O m–2 s–1) | ||||||||||||
| 1 | +0.20 | –0.97 | –1.65 | +0.07 | –0.14 | 0.606 | +1.62 | –0.24 | –1.56 | +1.52 | +0.28 | 1.044 |
| 2 | –0.20 | +0.80 | +3.91 | –0.36 | +0.11 | 1.076 | –2.74 | –0.30 | +4.05 | +3.31 | –0.80 | 2.24 |
| 3 | –0.62 | +2.05 | –0.60 | +1.39 | +1.47 | 1.226 | –1.75 | +0.83 | –0.55 | +1.10 | +1.61 | 1.168 |
| 4 | +2.10 | –6.07 | –7.19 | –3.48 | –5.14 | 4.796 | +5.59 | –4.90 | –7.40 | –0.30 | –4.30 | 4.498 |
| 5 | –2.96 | +9.17 | +11.62 | +4.61 | +7.44 | 7.16 | +0.08 | +10.95 | +11.01 | +7.08 | +7.85 | 7.394 |
| 6 | +1.47 | –3.89 | –4.22 | –2.06 | –3.09 | 2.946 | –3.24 | –6.18 | –3.72 | –6.65 | –4.28 | 4.814 |
| average | 1.258 | 3.825 | 4.865 | 1.995 | 2.898 | 2.968 | 2.503 | 3.9 | 4.715 | 3.327 | 3.187 | 3.526 |