Thiourea 99% for longan – A guide to even flowering
Longan – a "demanding" fruit crop for flower induction
In longan cultivation (especially nhãn long and nhãn tiêu da bò), inducing even flowering is very important:
✅ Easier orchard management
✅ Better fruit set, uniform attractive fruit
✅ Off-season harvest – higher selling prices
However, traditional methods (water withholding, pruning) often give uneven results and are labour-intensive.
Thiourea 99% is an effective option for breaking dormancy and stimulating strong, even flowering in longan.
Effects of Thiourea 99% on longan
- Wakes dormant buds after the physiological rest period
- Promotes flower-bud differentiation for even flowering and long, strong flower clusters
- Supports better fruit set, limiting flower and young fruit drop
How to use Thiourea 99% on longan
| Item | Details |
|---|---|
| Rate | 1,2 – 1,5% (12–15g Thiourea 99%/1 litre of water) |
| Timing | 3–4 weeks after harvest, once the trees have been pruned and given recovery fertiliser |
| How to spray | Spray evenly over the canopy, shoots and dormant buds to be treated |
| Number of treatments | 1–2 times, 10–15 days apart if needed |
| Adjuvant | Add Viet-up 90 for better adhesion and penetration |
Technical notes
✅ Spray only healthy trees with enough leaves after pruning
✅ Do not spray when the tree is producing new flushes
✅ Avoid spraying in rain or strong sun
Read more: Using Thiourea 99% on mango for even flowering
Using Thiourea 99% on lychee to stimulate flowering and fruit set
Thiourea 99% and off-season flower induction in dragon fruit
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