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Copy link Polysulphate Potato Trial in USA
15
Wisconsin, USA 2018
15
Key Conclusions
Polysulphate fertilizer is a soluble, easily absorbed, cost effective answer to crop nutrition, containing four key plant nutrients: sulfur, potassium, magnesium, and calcium.
Objective
To evaluate Polysulphate as a substitute potassium, calcium, and sulfur from muriate of potash and gypsum in conventional practice, for potato ‘Russet Burbank’ grown in central Wisconsin.
Trial Details
Trial station
Wisconsin, USA
Crop
Potato
Product
Polysulphate®
Treatments
Grower practice consists of 37 kg N/ha applied at planting as DAP. At emergence and active growth, 85 and 190 kg N/ha was applied, respectively as ammonium sulfate and ammonium nitrate. Phosphorus, derived from DAP, was applied at 185 kg P2O5/ha at planting. Potassium was applied pre-plant at 310 kg K2O/ha as MOP, and at 135 kg K2O/ha as SOP at planting. In addition, at pre-plant gypsum was applied at 560 kg/ha.
The Polysulphate treatment was a duplicate of the grower practice without the pre-plant MOP and gypsum. Instead, Polysulphate was applied at 1,680 kg/ha at pre-plant.
Treatments
Grower practice consists of 37 kg N/ha applied at planting as DAP. At emergence and active growth, 85 and 190 kg N/ha was applied, respectively as ammonium sulfate and ammonium nitrate. Phosphorus, derived from DAP, was applied at 185 kg P2O5/ha at planting. Potassium was applied pre-plant at 310 kg K2O/ha as MOP, and at 135 kg K2O/ha as SOP at planting. In addition, at pre-plant gypsum was applied at 560 kg/ha.
The Polysulphate treatment was a duplicate of the grower practice without the pre-plant MOP and gypsum. Instead, Polysulphate was applied at 1,680 kg/ha at pre-plant.
Results
- Marketable yield increased by 15% with the addition of Polysulphate.
- Polysulphate fertilization increased the marketable ideal* yield by 1.79 ton/ha over conventional grower practice.
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