Guide to selecting nitrogen-fixing trees (NFTs) based on the companion crops we are using in our agroforestry system — especially for perfumery and high-value trees like Aquilaria malaccensis (Agarwood), Sandalwood, Nutmeg, and Citrus.
Nitrogen-Fixing Tree Selection Guide for Agroforestry Systems
| Companion Crop | Recommended NFT(s) | Purpose / Compatibility |
|---|---|---|
| Aquilaria malaccensis (Agarwood) | Pterocarpus indicus – Narra Gliricidia sepium – Kakawate | – Provides filtered shade during early years – Enhances soil N for healthy resin development |
| Santalum album (Sandalwood) | Sesbania grandiflora – Katurai Leucaena leucocephala | – Fast-growing nurse trees – Help in hemiparasitic root connections of Sandalwood |
| Myristica fragrans (Nutmeg) | Albizia procera Calliandra calothyrsus | – Enhances flower and fruit production through N-fixation – Acts as windbreak and shade |
| Citrus aurantifolia (Calamansi) | Leucaena leucocephala Flemingia macrophylla | – Improves fruiting by maintaining nitrogen levels – Controls weeds when used as mulch |
| Cananga odorata (Ylang-Ylang) | Gliricidia sepium – kakawate Sesbania grandiflora – katurai | – Supports early growth with light shade – Excellent companion for flower crops |
| Michelia champaca (Golden Champaca) | Calliandra calothyrsus Albizia saman | – Encourages flowering with enriched soils – Attracts pollinators like bees |
| Cinnamomum verum (Cinnamon) | Flemingia macrophylla Desmodium spp. (ground cover) | – Boosts bark oil quality – Controls erosion in upland areas |
Pro Tips for Integration
- Spacing: NFTs should be spaced based on their canopy and root spread. Avoid planting them too close to slow-growing or shade-sensitive crops.
- Pruning Routine: Regular pruning encourages root nodulation and controls shade levels.
- Leaf Mulching: NFT leaves are nutrient-rich—perfect for mulching around Agarwood, Nutmeg, and Citrus.
Inoculation Reminder:
For maximum nitrogen fixation, inoculate NFTs at planting with Rhizobium or Frankia-based biofertilizers (depending on species). This boosts early root symbiosis and long-term productivity.