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Copy link Potato trial with Polysulphate
Increased potato yield
Nakuru, Kenya 2018
Increased potato yield
Key Conclusions
Polysulphate increased the tuber yield by 12% compared with the farmers’ practice while also reducing fertilizer costs by 23%. Overall, Polysulphate increased the net income by 13.1% compared with the farmers’ practice.
Objective
To investigate the efficiency of Polysulphate as a sulfur source which also includes potassium, magnesium, and calcium, and to compare it with the farmers’ practice which uses ammonium sulfate nitrate as a source of sulfur for potato crops.
Trial Details
Treatments
The trial utilized a randomized block design, with 2 treatments and 4 repetitions. The nitrogen and phosphorus applications were maintained at 121 kg N/ha and 92 kg P2O5/ha in both of the fertilizer treatments.
| Treatment | Fertilizer | Dose | Application | SO3 | K2O | Mg | Ca |
|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |||
| Farmers’ practice | DAP | 200 | At planting | 41.2 | 0 | 0 | 32.2 |
| ASN | 150 | At planting | |||||
| ASN | 150 | Top dressing | |||||
| CN + boron | 125 | Top dressing | |||||
| Polysulphate | DAP | 200 | At planting | 62.5 | 14.5 | 7.5 | 21.4 |
| Urea | 80 | At planting | |||||
| Polysulphate | 125 | At planting | |||||
| Urea | 106 | Top dressing |
Treatments
The trial utilized a randomized block design, with 2 treatments and 4 repetitions. The nitrogen and phosphorus applications were maintained at 121 kg N/ha and 92 kg P2O5/ha in both of the fertilizer treatments.
| Treatment | Fertilizer | Dose | Application | SO3 | K2O | Mg | Ca |
|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |||
| Farmers’ practice | DAP | 200 | At planting | 41.2 | 0 | 0 | 32.2 |
| ASN | 150 | At planting | |||||
| ASN | 150 | Top dressing | |||||
| CN + boron | 125 | Top dressing | |||||
| Polysulphate | DAP | 200 | At planting | 62.5 | 14.5 | 7.5 | 21.4 |
| Urea | 80 | At planting | |||||
| Polysulphate | 125 | At planting | |||||
| Urea | 106 | Top dressing |
Results
- The application of Polysulphate increased the tuber yield by 12% compared with the farmers’ practice
- The distribution of tuber size was similar in both treatments
- The Polysulphate treatment reduced fertilizer costs by 23%
- Polysulphate increased the net income by 13.1% compared with the farmers’ practice
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