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Copy link Polysulphate® Coffee Trial in Vietnam
Yield Increase
Di Linh district, Lam Dong Province, Vietnam 2015
Yield Increase
Key Conclusions
Supplementing NPK with Polysulphate fertilizer increased coffee yield by 9%, produced superior quality fruit indicated by a larger proportion of size A cores, and increased net profit by 10%.
Objective
To evaluate the efficacy of Polysulphate to increase coffee (Coffea robusta) yield in Vietnam, and to evaluate the cost-effectiveness of applying fertilizers in split doses compared to the traditional practice of a single application of urea, KCl, and fused Ca, Mg, and P.
Trial Details
Trial station
Di Linh district, Lam Dong Province, Vietnam
Crop
Coffee
Product
Granular Polysulphate 0-0-14
Assessments
Yield, fruit weight, and proportion of A-size cores
Treatments
This completely randomized block trial comprised 3 replications, each with 3 treatments:
- Traditional practice/control: single application of urea, KCl, and fused Ca, Mg, and P.
- Commercially available compound fertilizers (with S but no Ca or Mg).
- Same as the commercially available compound fertilizer treatment (2. above) but supplemented with Polysulphate.
In the 2 treatments, the total fertilizer dose was split into 4 applications, the first at the beginning of the dry season and the remaining 3 in the early, mid, and late rainy season.
| Treatment | Urea | Fused Ca Mg P | KCl | NPKS 16-16-8-13 | NPK 15-15-15 | NPKS 15-18-20-10 | Polysulphate |
|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| Control | 715 | 1,193 | 545 | - | - | - | - |
| Compound fertilizers + S | 250 | - | 200 | 400 | 500 | 500 | - |
| Compound fertilizers + S with Polysulphate | 250 | - | 153 | 400 | 500 | 500 | 200 |
Treatments
This completely randomized block trial comprised 3 replications, each with 3 treatments:
- Traditional practice/control: single application of urea, KCl, and fused Ca, Mg, and P.
- Commercially available compound fertilizers (with S but no Ca or Mg).
- Same as the commercially available compound fertilizer treatment (2. above) but supplemented with Polysulphate.
In the 2 treatments, the total fertilizer dose was split into 4 applications, the first at the beginning of the dry season and the remaining 3 in the early, mid, and late rainy season.
| Treatment | Urea | Fused Ca Mg P | KCl | NPKS 16-16-8-13 | NPK 15-15-15 | NPKS 15-18-20-10 | Polysulphate |
|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| Control | 715 | 1,193 | 545 | - | - | - | - |
| Compound fertilizers + S | 250 | - | 200 | 400 | 500 | 500 | - |
| Compound fertilizers + S with Polysulphate | 250 | - | 153 | 400 | 500 | 500 | 200 |
Results
- Supplementing NPK with Polysulphate resulted in an increase in yield of 9% and superior quality produce – more than 22% of the cores were of size A, or larger than 6.3 mm in diameter.
- Higher yield was due to faster growth, longer fruiting branches, less shedding of immature fruit, and larger and heavier cores.
- Polysulphate application also increased net profit by 10%.
Supplementing NPK with Polysulphate increased coffee yield by 9%.
Polysulphate fertilizer increased coffee fruit weight.
Number of size A coffee cores increased with Polysulphate.
Bars indicate LSD at 5%.
Source: Petrovietnam Fertilizer and Chemicals Corporation.
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