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Copy link Polysulphate Sweet Potato Trial in USA
7
Kenly, North Carolina, USA 2019
7
Key Conclusions
Compared with farmers’ fertilization practice, using a blend with Polysulphate increased sweet potato yield by 7%, and increased #1s by 12 bushels/ha.
Objective
To compare the effect on sweet potato (Ipomoea batatas) yield of replacing the farmers’ practice fertilizer blend with a blend which contains Polysulphate, in North Carolina, USA.
Trial Details
Trial station
Kenly, North Carolina, USA
Crop
Sweet Potato
Product
Granular Polysulphate
Assessments
Sweet potato yield
Treatments
Farmers’ practice consisted of a blend of DAP, MOP, and potassium-magnesium sulfate, while the Polysulphate treatment consisted of a blend of DAP, MOP and Polysulphate.
| Treatment | N | P2O5 | K2O | S | Mg | Ca |
|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| Farmer's blend | 23 | 61 | 225 | 17 | 8 | - |
| Blend with Polysulphate | 26 | 65 | 224 | 57 | 10 | 37 |
These blends were applied 2 weeks after setting. Both treatments had liquid UAN (urea ammonium nitrate) side dressed at mid-season.
Treatments
Farmers’ practice consisted of a blend of DAP, MOP, and potassium-magnesium sulfate, while the Polysulphate treatment consisted of a blend of DAP, MOP and Polysulphate.
| Treatment | N | P2O5 | K2O | S | Mg | Ca |
|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| Farmer's blend | 23 | 61 | 225 | 17 | 8 | - |
| Blend with Polysulphate | 26 | 65 | 224 | 57 | 10 | 37 |
These blends were applied 2 weeks after setting. Both treatments had liquid UAN (urea ammonium nitrate) side dressed at mid-season.
Results
- Compared with farmers’ fertilization practice, using a blend with Polysulphate increased sweet potato yield by 7%, and increased #1s by 12 bushels/ha.
- The results showed that with equal amounts of N, P, and K there is a benefit from choosing Polysulphate fertilizer due to the higher rate of plant-available sulfur and calcium. Also, the prolonged availability of the nutrients from Polysulphate may contribute to the enhanced yields.
Polysulphate fertilizer increases sweet potato yield.
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