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