Electrical resistance of discolored and decayed wood associated with 3-year-old wounds on red maple, in K ohms.
| Treatment | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree1 | Control | Orange shellac | Polyurethane varnish | Asphalt dressing | ||||||||
| B-1 | 2 | 4 | 72 | 6 | 14 | 1 | 2 | 1 | 2 | 2 | 1 | 1 |
| B-2 | 3 | 6 | 5 | 2 | 4 | 9 | 1 | 1 | 1 | 1 | 1 | 1 |
| B-3 | 7 | 15 | 2 | 5 | 2 | 2 | 1 | 1 | 1 | 3 | 1 | 1 |
| B-4 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 3 | 5 | 1 | 3 | 2 |
| B-5 | 20 | 26 | 26 | 12 | 2 | 2 | 3 | 1 | 1 | 1 | 1 | 4 |
| H-1 | 5 | 2 | 2 | 1 | 2 | 2 | 2 | 3 | 5 | 8 | 2 | 1 |
| H-2 | 5 | 20 | 6 | 20 | 29 | 15 | 3 | 9 | 17 | 3 | 4 | 7 |
| H-3 | 15 | 35 | 4 | 3 | 5 | 2 | 3 | 10 | 23 | 5 | 2 | 3 |
| H-4 | 2 | 30 | 22 | 9 | 6 | 6 | 8 | 1 | 5 | 15 | 2 | 3 |
| H-5 | 25 | 21 | 10 | –3 | 24 | 4 | 1 | 2 | 2 | 2 | 1 | 1 |
| Mean4 | 1 1.1 | 6.6 | 4.1 | 2.7 | ||||||||
↵1 B= Bartlett; H= Hubbard Brook.
↵2 In each group, the first figure is measurement made 5 cm above wound center; middle figure, at wound center; third figure, 5 cm below wound center. Measurements made with needle probes and Shigometer (Fig. 1). The measurements of the contiguous clear wood were fairly consistent per tree at readings above 40 K ohms, and for that reason they are not included here.
↵3 No measurement.
↵4 LSD = 3.4 (P V 0.05).