Process of Creating Durian Flower Buds in Off-Season & Controlling Residues for Export Standards
Entering the 11th Lunar month, the atmosphere in the Durian orchards of the Mekong Delta is “hotter” than ever with the off-season flowering process (làm bông vụ nghịch). However, erratic weather with night rains and frost poses a major challenge. How can we ensure “crab eyes” (flower buds) emerge brightly and evenly without exhausting the tree?
Nong Dien Phat would like to share the optimal technical process, ensuring both high productivity and compliance with strict export market standards.
1. The “4 Rights” Principle in Flower Induction Stage
At this stage, the durian tree needs to switch its state from vegetative growth (producing leaves) to reproductive growth (flowering). To achieve this, farmers need to remember these principles:
- Right Time: Leaves must be fully open and turned dark green (leathery leaf stage).
- Right Product: Use high-end, easily absorbable Phosphate and Potassium lines.
- Right Dosage: Avoid “rushing the process,” which causes leaf burn.
- Right Method: Combine water stress (cutting off water) and spraying both inside and outside the canopy.
2. Off-Season Flowering Process by Nong Dien Phat Experts
Step 1: Phosphate Application for Induction – “Strong Foundation, Durable Tree”
When the final shoot flush has opened, farmers should apply basal fertilizers using Fused Calcium Magnesium Phosphate or specialized Imported Induction Phosphate.
- Dosage: Depends on tree age and canopy diameter (Average 3-5kg/tree).
- Note: Water heavily to ensure the fertilizer dissolves completely and penetrates the root zone to store energy.
Step 2: Foliar Spray for Induction & Shoot Inhibition
Use foliar fertilizers with high Phosphate and Potassium content (such as 10-60-10 or Imported MKP) to spray evenly on both sides of the leaves.
- Purpose: Helps leaves age quickly, inhibits young shoot development, and concentrates nutrients in the stems for flower bud differentiation.
Step 3: Water Stress and Tarp Covering (Deciding Factor)
This is the most critical technique for the off-season crop. Cutting off water puts the tree under “stress,” forcing it to flower for survival. Ensure garden ditches are drained and roots are covered tightly with tarps to prevent rain infiltration.
3. New Trend: “Clean” Flowering for Export
Previously, abusing high doses of Paclobutrazol to force flowering was a common habit. However, this has led to major consequences: residue in soil and fruit, causing Durian to fail inspections when exporting to China or Europe.
At Nong Dien Phat, we recommend farmers apply the “Smart Nutrition” solution:
- Use Imported Organic Potassium lines to replace a portion of chemical fertilizers, ensuring the tree is not exhausted after bearing fruit.
- Supplement with Chelated Micro-nutrients to help “crab eyes” (buds) grow bright and fat, minimizing dry/black buds without overdosing on stimulants.
4. Conclusion
Off-season flowering is a race of technology and technique. With a commitment to sustainable development, Nong Dien Phat provides high-quality imported fertilizer lines with transparent origins, helping farmers not only win the harvest but also win big in the export market.
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