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Copy link Durian Trial with NovAcid and Polysulphate
Yield increase
Dak Mil, Dak Nong, Central Highlands, Vietnam
Yield increase
Key Conclusions
- ICL WSNPK + Polysulphate increased durian yield by 9% and income by 20.5%.
- Trees showed stronger post‑harvest vigor, supporting next‑season performance.
- Farmer switched to ICL Novacid after seeing the trial results.
Objective
To evaluate the effects of ICL water soluble NPK fertilizer NovAcid applied via fertigation, combined with a topdress application of Polysulphate Standard, during flowering through harvest of durian trees in the rainy season.
Trial Details
Trial station
Dak Mil, Dak Nong, Central Highlands, Vietnam
Assessments
• Yield • Income • Fruit and leaf growth
Treatments
From 1 March to 30 September 2025, two treatments were conducted on a durian farm. Trees in both treatments were 5 years old, planted at a density of 160 trees/ha.
ICL Plot
- Weekly fertigation using ICL water soluble NPK fertilizers NovAcid 19‑19‑19+3CaO+TE and Novacid 12‑4‑36+3CaO+TE)
- One application of Polysulphate Standard at 1.5 kg/tree, applied 30 days after flower opening
Control Plot (Farmer Practice)
- Topdressing with a granular NPK fertilizer
- Same drip irrigation system used only for water delivery
Nutrient Inputs
| Nutrient Input (kg/ha) | ICL Plot | Farmer Practice |
|---|---|---|
| N | 78 | 78 |
| P₂O₅ | 75 | 75 |
| K₂O | 160 | 160 |
| CaO | 60 | 0 |
| MgO | 18 | 0 |
| SO₃ | 129 | 0 |
Treatments
From 1 March to 30 September 2025, two treatments were conducted on a durian farm. Trees in both treatments were 5 years old, planted at a density of 160 trees/ha.
ICL Plot
- Weekly fertigation using ICL water soluble NPK fertilizers NovAcid 19‑19‑19+3CaO+TE and Novacid 12‑4‑36+3CaO+TE)
- One application of Polysulphate Standard at 1.5 kg/tree, applied 30 days after flower opening
Control Plot (Farmer Practice)
- Topdressing with a granular NPK fertilizer
- Same drip irrigation system used only for water delivery
Nutrient Inputs
| Nutrient Input (kg/ha) | ICL Plot | Farmer Practice |
|---|---|---|
| N | 78 | 78 |
| P₂O₅ | 75 | 75 |
| K₂O | 160 | 160 |
| CaO | 60 | 0 |
| MgO | 18 | 0 |
| SO₃ | 129 | 0 |
Results
- NovAcid + Polysulphate increased yield by 9.02% and total income by 20.5% compared with farmer practice.
- Post‑harvest, trees in the ICL plot showed stronger leaf flushes and better vigor, indicating improved preparation for the next season.
- After the demonstration, the farmer in the control plot switched to NovAcid for the following season.
- Based on these results, investing in Novacid and Polysulphate proved as profitable for mature durian trees.
| Treatment | Yield (tons/ha) | Income (USD/ha) |
|---|---|---|
| NovAcid + Polysulphate | 8.66 | 15,607 |
| Farmer practice | 7.98 | 12,947 |
A durian tree from the ICL plot shows greater vigor after harvest.
A durian tree from the Farmer Practice plot.
Control (Farmer’s practice) had more mishapen and less uniform fruits.
Fruits were more rounded and uniform with ICL treatment.
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