(experiment 2) Sucrose-enhanced recovery of leaf PI, necrosis, and chlorophyll content of containerized English oak (Quercus robur L.) placed outdoors with time (weeks) based on quadratic regression analysis after application of salt (NaCl).
| Treatment | PI | Leaf necrosis | Chlorophyll content | |||
|---|---|---|---|---|---|---|
| Regression: y = a + bT + cT2 | r2 | Regression: y = a + bT + cT2 | r2 | Regression: y = a + bT + cT2 | r2 | |
| 30 g NaCl | y = −3.98 + 3.29T − 0.28T2 | 0.93 | y = 4.98 to 0.15T − 0.02T2 | 0.99 | y = 8.01 + 0.35T − 0.08T2 | 0.98 |
| 60 g NaCl | y = −4.75 + 2.82T − 0.23T2 | 0.94 | y = 5.36 to 0.11T − 0.03T2 | 0.94 | y = 7.27 + 0.60T + 0.05T2 | 0.86 |
| Sucrose 25 g + 30 g NaCl | y = −10.94 + 6.23T − 0.48T2 | 0.90 | y = 5.71 to 0.31T − 0.02T2 | 0.97 | y = 11.11 to 2.57T + 0.62T2 | 0.90 |
| Sucrose 25 g + 60 g NaCl | y = −6.58 + 3.95T − 0.31T2 | 0.97 | y = 5.18 to 0.29T − 0.03T2 | 0.91 | y = 8.86 to 1.19T + 0.41T2 | 0.98 |
| Sucrose 50 g + 30 g NaCl | y = −6.41 + 3.45T − 0.28T2 | 0.95 | y = 4.43 + 0.26T − 0.67T2 | 0.99 | y = 13.42 to 4.01T + 0.71T2 | 0.93 |
| Sucrose 50 g + 60 g NaCl | y = −5.90 + 3.03T − 0.24T2 | 0.94 | y = 5.59 to 0.23T − 0.02T2 | 0.98 | y = 9.33 to 1.68T + 0.50T2 | 0.97 |
y, leaf PI, necrosis, and chlorophyll content value; a, leaf PI, necrosis and chlorophyll content of control value (calculated intercept); b, rate of PI, necrosis, and chlorophyll content with time (T), c, = rate of change. PI and chlorophyll values mean of six trees, five leaves per tree, leaf necrosis values mean of six trees.