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Copy link Canola Trial with Polysulphate
37
West Broomehill, Western Australia 2021
37
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
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). |
|||||||||
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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