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Copy link Polysulphate Soybean Trial in Paraguay
10.8
Itapúa, Paraguay 2018
10.8
Key Conclusions
Soybean crop showed a significant yield increase of up to 10.8% in response to Polysulphate application when compared with the control treatment.
Objective
To compare the agronomic efficiency of bulk fertilizer blends that include Polysulphate with other formulations currently in use for soybean crop in Paraguay.
Trial Details
Trial station
Itapúa, Paraguay
Crop
Soybean
Product
Polysulphate®
Assessments
Soybean yield
Treatments
The five treatments consisted of two common fertilizer blends (5-20-10 and 5-30-15) having different proportions of P2O5:K2O (2:1 and 3:1) and were prepared using MAP, SSP, and a K source (KCl or Polysulphate). The four grades were compared with mono-ammonium-phosphate (MAP) as a control lacking S, K and Mg. All five treatments received the same rate of 70 kg P2O5 ha–1.
| Treatment (fertilizer blend) | P2O5 : K2O | Grade NPKS | Fertilizer rate | N | P2O5 | K2O | MgO | S | |
|---|---|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | ||||
| T1 | Control - MAP | - | 10-52-0-0 S | 135 | 15 | 70 | - | - | - |
| T2 | MAP, SSP, KCl | 3:1 | 5-30-10-5 S | 233 | 11 | 70 | 23 | - | 11 |
| T3 | MAP, SSP, Polysulphate | 3:1 | 6-30-10-6 S | 233 | 15 | 70 | 23 | 5 | 15 |
| T4 | MAP, SSP, KCl | 2:1 | 5-30-10-5 S | 233 | 12 | 70 | 35 | - | 8 |
| T5 | MAP, SSP, Polysulphate | 2:1 | 6-30-10-6 S | 233 | 15 | 70 | 35 | 3 | 10 |
Treatments
The five treatments consisted of two common fertilizer blends (5-20-10 and 5-30-15) having different proportions of P2O5:K2O (2:1 and 3:1) and were prepared using MAP, SSP, and a K source (KCl or Polysulphate). The four grades were compared with mono-ammonium-phosphate (MAP) as a control lacking S, K and Mg. All five treatments received the same rate of 70 kg P2O5 ha–1.
| Treatment (fertilizer blend) | P2O5 : K2O | Grade NPKS | Fertilizer rate | N | P2O5 | K2O | MgO | S | |
|---|---|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | ||||
| T1 | Control - MAP | - | 10-52-0-0 S | 135 | 15 | 70 | - | - | - |
| T2 | MAP, SSP, KCl | 3:1 | 5-30-10-5 S | 233 | 11 | 70 | 23 | - | 11 |
| T3 | MAP, SSP, Polysulphate | 3:1 | 6-30-10-6 S | 233 | 15 | 70 | 23 | 5 | 15 |
| T4 | MAP, SSP, KCl | 2:1 | 5-30-10-5 S | 233 | 12 | 70 | 35 | - | 8 |
| T5 | MAP, SSP, Polysulphate | 2:1 | 6-30-10-6 S | 233 | 15 | 70 | 35 | 3 | 10 |
Results
- Soybean crop showed significant yield increase in response to Polysulphate application compared with the control treatment, increasing yield by 6.8% and 10.8% for treatments T3 (23 kg K2O/ha) and T5 (35 kg K2O/ha), respectively.
- The use of Polysulphate significantly increased soybean yield by 5.3% (T3: 23 kg K2O/ha, 3:1 P:K ratio) when compared with KCl as K source (T2); but there was no advantage between KCl and Polysulphate at the higher K2O dose (2:1 P:K ratio).
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