Using lime in potato production ensures the correct pH and the nutritional balance of the potato crops. Calcium and magnesium from the lime help reduce internal defects in the potato and produce a better end product. The best crop and quality of potatoes are obtained when the pH is around 6.0. However, potatoes can grow at a lower pH. It is normally advisable to avoid liming during the potato season as this can lead to a Streptomyces attack.
Potatoes have high magnesium requirements. The Mg-Al values should be in Class 3 to ensure that the potatoes have an adequate supply of this important nutrient. For potatoes, you should therefore use a type of lime that contains magnesium.