Foliar nutrient status of Pyrus calleryana trees grown in the three pit types. Leaves were collected on August 15, 2011, and August 29, 2012 approximately 12–14 weeks after the full bloom.
| Planting pit technique | 2011 and 2012 Nutrients Mean (%) | Mean (μg/g) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | P | K | Ca | Mg | Al | B | Co | Cu | Fe | Mn | Mo | Na | Ni | Zn | |
| Small covered | 1.27b | 0.10b | 1.23b | 2.14 | 0.23 | 21.73 | 5.25 | 0.25 | 0 | 52.58b | 14.20b | 0 | 165.20 | 8.00 | 23.60b |
| Large covered | 1.60b | 0.13ab | 1.31 ab | 2.16 | 0.24 | 22.73 | 9.05 | 0.40 | 0 | 67.23a | 16.20ab | 0 | 184.40 | 8.95 | 29.85ab |
| Open | 1.96a | 0.15a | 1.49a | 2.31 | 0.22 | 22.38 | 10.30 | 0.30 | 0.15 | 72.13a | 21.15a | 1.30 | 169.15 | 12.80 | 36.60a |