Leaf area (LA), shoot length, net photosynthesis (Pn), and water use efficiency (WUE) of English oak (Quercus robur ‘Select’) as affected by different planting-hole backfill mixes.
| Treatment | LAZ (cm2) | Shoot lengthy (cm) | Pnx (μmol CO2*m-2*sec-1) | WUEw (μmol CO2*mmol H2O) |
|---|---|---|---|---|
| Compostv | 20.80 br | 4.73 a | 7.81 a | 9.46 a |
| Fertilizationu | 24.99 a | 4.40 ab | 7.40 a | 8.42 ab |
| Leonarditet | 22.02 ab | 3.89 b | 7.21 a | 7.31 b |
| Controls | 20.85 b | 4.02 ab | 7.22 a | 8.89 ab |
↵z Each value is the mean of 50 leaves per plant.
↵y Each value is the mean of 20 shoots per plant.
↵x Readings were taken on five fully expanded leaves per plant under condition of light saturation (PAR > 1,000 μmolm-2s-1) on two dates and averaged.
↵w WUE was calculated by dividing Pn by E.
↵v Excavated soil with 50% of high quality compost.
↵u Excavated soil + Nitrophoska blu Spezial, 1 kg.
↵t Excavated soil + leonardite, 2 kg of commercial product Humisol.
↵s Holes backfilled with excavated soil.
r Means within columns followed by different letters are significantly different from each other using LSD test, α = 0.05 level.