Polysulphate Sweet Potato Trial in USA

7

Yield Increase
Polysulphate fertilizer increased sweet potato yield by 7% compared to the farmer’s fertilization practice in a trial in North Carolina, USA.

Kenly, North Carolina, USA
2019

Trail

7

Yield Increase

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.

 

TreatmentNP2O5K2OSMgCa
kg/hakg/hakg/hakg/hakg/hakg/ha
Farmer's blend2361225178-
Blend with Polysulphate2665224571037

 

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.

 

TreatmentNP2O5K2OSMgCa
kg/hakg/hakg/hakg/hakg/hakg/ha
Farmer's blend2361225178-
Blend with Polysulphate2665224571037

 

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.

Polysulphate fertilizer increases sweet potato yield.

 

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