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Copy link Polysulphate Soybean Trial in Argentina
61
Mercedes, Corrientes, Argentina 2017
61
Key Conclusions
This trial comparing the efficiency of different sources of sulfur found that soybean grown with Polysulphate fertilizer in Northeast Argentina showed an impressive increase in yield of up to 61%.
Objective
To compare, under soybean (Glycine max) grown in field conditions, the agronomic and economic efficiency of fertilizer bulk blends that include Polysulphate with other current formulations.
Trial Details
Trial station
Mercedes, Corrientes, Argentina
Crop
Soybean
Product
Polysulphate®
Assessments
Soybean grain yield
Treatments
The treatments were allocated in a randomized complete block design with four replications.
All the treatments were based on different sources of S that were applied at sowing and with a single rate of P (30 kg/ha or 27 lbs/acre P2O5). In addition to the sulfur containing treatments, a control with no sulfur was included (MAP was used to provide the necessary phosphorus). Gypsum and single super phosphate (SSP) treatments were included since they were the common sources of S with comparable rates of S to Polysulphate (19 kg/ha or 17 lbs/acre).
| Treatment - blends (w/w) | Fertilizer rate | N | P2O5 | K2O | Mg | S |
|---|---|---|---|---|---|---|
| kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | |
| Control (MAP only) | 58 (52) | 6 (5) | 30 (27) | - | - | - |
| SSP | 158 (141) | 0 | 30 (27) | - | - | 19 (17) |
| MAP + Gypsum (S=19) | 167 (149) | 6 (5) | 30 (27) | 0 | 0 | 19 (17) |
| MAP + Polysulphate (S=19) | 158 (141) | 6 (5) | 30 (27) | 14 (21) | 4 (3) | 19 (17) |
| MAP + Polysulphate (S=38) | 258 (230) | 6 (5) | 30 (27) | 28 (25) | 7 (6) | 38 (34) |
| MAP + Polysulphate (S=57) | 358 (319) | 6 (5) | 30 (27) | 42 (37) | 11 (10) | 57 (51) |
Treatments
The treatments were allocated in a randomized complete block design with four replications.
All the treatments were based on different sources of S that were applied at sowing and with a single rate of P (30 kg/ha or 27 lbs/acre P2O5). In addition to the sulfur containing treatments, a control with no sulfur was included (MAP was used to provide the necessary phosphorus). Gypsum and single super phosphate (SSP) treatments were included since they were the common sources of S with comparable rates of S to Polysulphate (19 kg/ha or 17 lbs/acre).
| Treatment - blends (w/w) | Fertilizer rate | N | P2O5 | K2O | Mg | S |
|---|---|---|---|---|---|---|
| kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | kg/ha (lbs/acre) | |
| Control (MAP only) | 58 (52) | 6 (5) | 30 (27) | - | - | - |
| SSP | 158 (141) | 0 | 30 (27) | - | - | 19 (17) |
| MAP + Gypsum (S=19) | 167 (149) | 6 (5) | 30 (27) | 0 | 0 | 19 (17) |
| MAP + Polysulphate (S=19) | 158 (141) | 6 (5) | 30 (27) | 14 (21) | 4 (3) | 19 (17) |
| MAP + Polysulphate (S=38) | 258 (230) | 6 (5) | 30 (27) | 28 (25) | 7 (6) | 38 (34) |
| MAP + Polysulphate (S=57) | 358 (319) | 6 (5) | 30 (27) | 42 (37) | 11 (10) | 57 (51) |
Results
- Soybean responded significantly to sulfur application.
- There were statistically significant differences between Polysulphate and other sources of sulfur (SSP and gypsum). Additionally, soybean yield responded positively to increasing rates of Polysulphate.
Polysulphate fertilizer increases soybean grain yield.
Different letters above bars indicate significant differences among treatments (p<0.05)
From research funded by the International Potash Institute www.ipipotash.org.
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