UK Polysulphate Winter Oilseed Rape Trial

33.6

Yield Increase
Polysulphate fertilizer application increased the yield of oilseed rape by over 33%.

2018

Trail

33.6

Yield Increase

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.

 

T1T2T3T4
"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 springpolysulphate 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.

 

T1T2T3T4
"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 springpolysulphate 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%.

Polysulphate applied at 100 kg/ha resulted in an increase in oilseed rape yield of approximately 8%.

 

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