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Copy link Canola Trial with Polysulphate®
Yield Increase
West Broomehill, Western Australia 2021
Yield Increase
Key Conclusions
Canola yield increased in line with Polysulphate application rate, producing up to 37% yield increase compared to the NPS treatment.
Objective
To evaluate the effect on canola yield of Polysulphate applied at 3 rates when compared with NPS and NPKS fertilizers.
Trial Details
Trial station
West Broomehill, Western Australia
Crop
Canola
Product
Granular Polysulphate 0-0-14
Assessments
Canola yield
Treatments
The trial took place with canola (Brassica napus) cultivar GT-53, sown on 4 May 2021 and harvested in December 2021.
This randomized block experiment contained 7 treatments and 4 replications. The treatments consisted of the application of 50 kg/ha of N and 15 kg/ha of P to all treatments. Different combinations of MAP, Polysulphate, NPS and KCl were tested, resulting in different doses of S and K.
| Treatments | MAP | NPS | Polysulphate | KCl | Liquid N fertilizer1 | N | P | K | S |
|---|---|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| MAP | 69 | 134.8 | 50 | 15 | 0 | 1.0 | |||
| MAP+Polysulphate20 | 69 | 20 | 134.8 | 50 | 15 | 2.2 | 5.0 | ||
| MAP+Polysulphate40 | 69 | 40 | 134.8 | 50 | 15 | 4.5 | 8.9 | ||
| MAP+Polysulphate60 | 69 | 60 | 134.8 | 50 | 15 | 6.7 | 12.9 | ||
| NPS2 | 107 | 108.3 | 50 | 15 | 0.0 | 10.3 | |||
| NPS2+KCl | 107 | 13.4 | 108.3 | 50 | 15 | 6.7 | 10.3 | ||
| MAP+KCl | 69 | 13.4 | 134.8 | 50 | 15 | 6.7 | 1.0 | ||
| 2 Liquid nitrogen fertilizer: urea ammonium nitrate (UAN 32N), split between sowing and topdress. 2 NPS fertilizer 14.3N-14P-0K+9.6S (elemental analysis). |
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Treatments
The trial took place with canola (Brassica napus) cultivar GT-53, sown on 4 May 2021 and harvested in December 2021.
This randomized block experiment contained 7 treatments and 4 replications. The treatments consisted of the application of 50 kg/ha of N and 15 kg/ha of P to all treatments. Different combinations of MAP, Polysulphate, NPS and KCl were tested, resulting in different doses of S and K.
| Treatments | MAP | NPS | Polysulphate | KCl | Liquid N fertilizer1 | N | P | K | S |
|---|---|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| MAP | 69 | 134.8 | 50 | 15 | 0 | 1.0 | |||
| MAP+Polysulphate20 | 69 | 20 | 134.8 | 50 | 15 | 2.2 | 5.0 | ||
| MAP+Polysulphate40 | 69 | 40 | 134.8 | 50 | 15 | 4.5 | 8.9 | ||
| MAP+Polysulphate60 | 69 | 60 | 134.8 | 50 | 15 | 6.7 | 12.9 | ||
| NPS2 | 107 | 108.3 | 50 | 15 | 0.0 | 10.3 | |||
| NPS2+KCl | 107 | 13.4 | 108.3 | 50 | 15 | 6.7 | 10.3 | ||
| MAP+KCl | 69 | 13.4 | 134.8 | 50 | 15 | 6.7 | 1.0 | ||
| 2 Liquid nitrogen fertilizer: urea ammonium nitrate (UAN 32N), split between sowing and topdress. 2 NPS fertilizer 14.3N-14P-0K+9.6S (elemental analysis). |
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Results
- There was a linear canola yield increase with the increase in Polysulphate rate.
- MAP+Polysulphate treatments gave higher yields than the MAP and NPS treatments, with or without KCl.
- MAP+40 kg Polysulphate gave significantly higher yield than NPS+KCl and MAP+KCl, despite all treatments receiving the same rate of potassium.
- The economic analysis shows that MAP+40 kg Polysulphate and MAP+60 kg Polysulphate had the highest relative margins at AUD$ 1,274 and AUD$ 1,421/ha, respectively, compared to the lowest margin of AUD$ 1,002/ha for the NPS treatment.
Polysulphate increased canola yield by up to 37%.
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