The behaviour of potassium (K) in clay soils mainly depends on the clay content and the type of clay mineral. Soils with clay minerals mainly.

Second to nitrogen, potassium (K) is adsorbed most by the plant and is essential for its normal growth and development.

Potatoes need much potassium (K). Second to nitrogen, K is adsorbed most by the plant.

When potato originally was introduced from South America to Europe and from there was distributed globally, hardly any diseases and pests came.

Silver scurf is caused by the fungus Helminthosporium solani. It is a very common potato disease which only develops on tubers. In the field early.