Potassium is one of the sixteen nutrient elements which is needed by plants for healthy growth. It is second only to nitrogen in the quantities required by plants.
Potassium is very mobile within plants, and performs a wide range of vital roles in plant systems, including photosynthesis, enzyme activation, stomatal control and transporting plant sugars.
Although potassium occurs naturally as up to 3.5% of the earth's crust, only a small proportion of it is available to plants. After many years of agricultural production, and removal of potassium in produce harvested from the field, even soils which were naturally well supplied will become depleted.
If soil potassium supplies are insufficient to meet plant requirements, supplementation by potash fertilisers - fertilisers containing potassium - is necessary to maintain healthy plant growth and a sustainable agricultural environment.
Select a button above right to find out more about potassium in plants, soils and fertilisers.