Trials using Polysulphate™
Release of sulphate fron Polysulphate vs. other sources
100%
Polysulphate delivers some sulphate available straight after application, but continues to release most of its sulphate into the soil solution over several weeks for uptake as the crop grows. Other sources can release all their sulphate in a matter of days. Polysulphate can be applied in good time in the late winter/spring with much less risk of sulphate loss through leaching.
75%
Ammonium sulphate Sulphate of potash Kieserite Polysulphate
50%
25%
0
0 5 10 15 20 25 30 35 40 45
50
Days/pore volumes
Yield of cabbage
15.0
12.5
10.0
40% yield increase
7.5
5.0
A field trial of cabbage in Lincolnshire clearly demonstrated the beneficial effect of Polysulphate, with a yield increase of about 40%.
2.5
0.0
Control
Polysulphate
Yield of vining peas
7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0
27.5% yield increase
A field trial of Polysulphate for vining peas grown for freezing showed a yield increase of more than 1 t/ha, resulting in an increase in value of the crop in excess of £550/ha.
Control
Polysulphate
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