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Copy link UK Polysulphate Winter Oilseed Rape Trial
33.6
2018
33.6
Key Conclusions
In these results, Polysulphate increased the yield of oilseed rape by up to 33%, between 200 kg/ha and 1.15 t/ha (T2 gave the best results). When we look at the return after fertilizer costs have been deducted, we see that T1 gave an extra £62.94/ha, T2 gave an extra £291.70/ha, and T3 gave an extra £21.60/ha over the control.
Objective
In this trial we look at autumn and spring applications of sulphate to Winter Oilseed Rape (WOSR, Brassica napus), primarily looking at yield with different timings of sulfur. We investigate split applications of S, how this can help with establishment of the crop, and winter hardiness.
Trial Details
Crop
Oilseed Rape
Product
Granular Polysulphate
Assessments
Yield
Treatments
We looked at 3 different rates of Polysulphate application onto winter oilseed rape (WOSR). The whole field had a base fertilizer of 250 kg/ha 0-20-30. T1, T3 and T4 (farm practice) received 96 kg/ha of SO3 in a single application. T2 received 2 applications of sulfate to the equivalent of 192 kg/ha of SO3, split 96 kg/ha at planting and 96 kg/ha early spring. All areas received 30 kg/ha of nitrogen at planting.
| T1 | T2 | T3 | T4 |
|---|---|---|---|
| "Polysulfate 200 kg/ha in the fall (at planting)" | Polysulfate 200 kg/ha in the fall (at planting) | Ammonium sulfate applied to this area |
|
| polysulphate 200 kg/ha in early spring | polysulphate 200 kg/ha in early spring |
Treatments
We looked at 3 different rates of Polysulphate application onto winter oilseed rape (WOSR). The whole field had a base fertilizer of 250 kg/ha 0-20-30. T1, T3 and T4 (farm practice) received 96 kg/ha of SO3 in a single application. T2 received 2 applications of sulfate to the equivalent of 192 kg/ha of SO3, split 96 kg/ha at planting and 96 kg/ha early spring. All areas received 30 kg/ha of nitrogen at planting.
| T1 | T2 | T3 | T4 |
|---|---|---|---|
| "Polysulfate 200 kg/ha in the fall (at planting)" | Polysulfate 200 kg/ha in the fall (at planting) | Ammonium sulfate applied to this area |
|
| polysulphate 200 kg/ha in early spring | polysulphate 200 kg/ha in early spring |
Results
The application of Polysulphate increased the yield in all cases. Autumn and spring application increased the yield by an extra 1.15 t/ha over the farm practice.
Polysulphate applied at 100 kg/ha resulted in an increase in oilseed rape yield of approximately 8%.
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