Wood density is an important indicator of resin accumulation and tree defense. Resin deposition increases the weight and hardness of the affected wood over time.
1. Why Wood Density Changes
- Resin is a highly polymerized mixture of sesquiterpenes and chromones
- Deposited in vascular tissues and wood parenchyma
- Localized resin zones become denser than surrounding wood
- Density is correlated with resin quality: darker, more aromatic resin usually equals heavier, denser wood
2. Stages of Wood Density Change
| Stage | Description | Farmer Observation |
|---|---|---|
| Early (1–3 months) | Resin begins forming in vessels | Soft, slightly sticky wood around wound |
| Mid (3–12 months) | Resin polymerization → wood hardens | Wood feels heavier and firmer |
| Late (>12 months) | Fully polymerized resin zone | Dense, dark resin streaks, can sink in water slightly |
3. Practical Implications
- Denser wood = higher resin content → premium quality agarwood
- Soft, light-colored zones → early resin or incomplete induction
- Over-wounding or excessive chemical stress → necrotic tissue, density may vary irregularly
4. Farmer Key Message
“Touch and weight tell the story.
Denser wood around the wound = more resin. Be patient — the tree adds substance over months.”
5. Farmer Tips
✔ Monitor resin zone firmness and weight regularly
✔ Combine color, smell, and density for resin quality assessment
✔ Avoid harvesting too early — wood may be soft and resin content low
✔ Record resin zone location, density, and color for future induction optimization