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Copy link Polysulphate Carrot Trial in France
24
Yield Increase
Polysulphate fertilizer, compared to other potassium sources, resulted in the highest carrot yield, 24% higher than the control.
Saint-Jean-Brévelay, Brittany, France 2019
24
Key Conclusions
In this comparison of 3 different sources of potassium, the trial found that Polysulphate fertilizer resulted in the highest carrot yield, 24% higher than the control.
Objective
To compare 3 different sources of potassium (MOP, SOP, and Standard Polysulphate) on the yield of carrots (Daucus carota cv. Salto) grown in the north–west of France.
Trial Details
Trial station
Saint-Jean-Brévelay, Brittany, France
Product
Standard Polysulphate
Assessments
Yield
Treatments
- The trial consisted of micro plots with 4 replicates. The plots were sown in April 2019, and harvested in July 2019
- The treatments had the same potassium dose (250 kg K2O/ha) given as either MOP, SOP, or Standard Polysulphate.
- Nitrogen was applied as per farmers’ practice at a rate of 84 kg N/ha (as 250 kg of ammonium nitrate).
- No phosphorus was applied because soil analysis showed a high soil P content.
Treatments
- The trial consisted of micro plots with 4 replicates. The plots were sown in April 2019, and harvested in July 2019
- The treatments had the same potassium dose (250 kg K2O/ha) given as either MOP, SOP, or Standard Polysulphate.
- Nitrogen was applied as per farmers’ practice at a rate of 84 kg N/ha (as 250 kg of ammonium nitrate).
- No phosphorus was applied because soil analysis showed a high soil P content.
Results
Polysulphate application increased carrot yield in all cases:
- Polysulphate increased carrot yield by 24% compared with the control (no K application);
- Polysulphate increased carrot yield by 12.5% compared to MOP; and
- Polysulphate increased carrot yield by 3% compared to SOP.
Polysulphate fertilizer increased carrot yield by 24%.
From research funded by the International Potash Institute www.ipipotash.org.
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