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Copy link Polysulphate Potato Trial on Sandy Loam Soil
17.6%
Yield increase
Polysulphate increased total potato yield by 17.6% with reduced fertilizer costs per acre in Michigan, USA trial
Entrican, Michigan, USA 2021
17.6%
Yield increase
Key Conclusions
Polysulphate improves grower profitability through both increased yield as well as potentially reduced fertilizer cost per acre.
Objective
To investigate the effect of Polysulphate fertilizer as a nutrient source for production of ‘Lamoka’ potatoes in comparison to a grower standard practice consisting of gypsum (calcium sulfate) and MOP.
Trial Details
Trial station
Entrican, Michigan, USA
Crop
Potato
Product
Polysulphate®
Assessments
Total tuber yield.
Treatments
- All treatments received 244 lb N, 79 lb P2O5, and 200 lb K2O per acre.
- The grower standard practice (GSP) included gypsum (1000 lb/A) and MOP (323 lb/A).
- A gypsum only treatment was included for comparison. – Granular Polysulphate was applied at rates of either 357 or 720 lb per acre with the remaining potassium requirement supplied with MOP.
- The treatments were evaluated in a randomized complete block design with four replications.
Treatments
- All treatments received 244 lb N, 79 lb P2O5, and 200 lb K2O per acre.
- The grower standard practice (GSP) included gypsum (1000 lb/A) and MOP (323 lb/A).
- A gypsum only treatment was included for comparison. – Granular Polysulphate was applied at rates of either 357 or 720 lb per acre with the remaining potassium requirement supplied with MOP.
- The treatments were evaluated in a randomized complete block design with four replications.
Results
- Polysulphate application increased total tuber yield compared to the grower standard practice (GSP)
- Despite containing 189 lb/A less Ca and 117 lb/A less S compared to the application rate of gypsum used, Polysulphate increased yield compared to the GSP
- Polysulphate at 357 lb/A resulted in a 17.6% increase that was statistically significant.
- This study demonstrates that nutrient source is important for optimizing potato yield and fertilizer return-on-investment.
The four-in-one natural fertilizer
