Sulphur helps to reduce the level of common and powdery scab. This effect may be due to a reduction in the soil pH where elemental sulphur is used.
Best effects come from applying sulphur to the soil in a readily available form at planting. However, a program of foliar sulphur can also reduce scab, as study in Scotland shows.
The potato crop has a demand for sulphur in similar quantities to magnesium. Where potassium sulphate is commonly used, supplies are usually adequate. Best effects come from applying sulphur to the soil in a readily available form at planting.
|Sulphur at potato growth stages|
|Planting||Common and powdery scab and tuber numbers|