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For optimum frost protection – potassium and magnesium increase winter hardiness

Temperatures way below the freezing point cause stress for plants, and may present considerable risks to farmers. Weather extremes such as severe frosts have become more frequent: the climate is changing, and in many countries dry and hot periods as well as unusually cold periods have become a common occurrence. To farmers, risk reduction and safeguarding high yields even under unfavourable weather conditions have become prime concerns – this also includes optimum frost protection.

Protection against winterkill

Ice crystals forming at minus degrees may destroy plant cells. Plants try to protect themselves against winterkill by a process called acclimatisation: they will store osmotically effective substances such as sugar and potassium within their cells. Both substances serve as antifreeze agents, by lowering the cell sap’s freezing point, thereby maintaining cell functionality. The sugar required for this process is produced by the plant itself, via photosynthesis. This process requires potassium, but also magnesium.

Protection against winter desiccation

Deeply frozen soil prevents plants from absorbing sufficient water. Plants are most at risk when evaporation rates are high from sunny and windy weather. They may literally “die of thirst”. Potassium and magnesium help to protect plants against this winter desiccation: Potassium regulates the plants water balance, preventing uncontrolled loss of water via the foliage. Magnesium promotes root, growth, allowing plants to use this better developed root system to draw water from even deeper layers of superficially frozen soils.

Protection against frost heaves

Alternating frosts and thaws – such as warm days and strong frosts at night in early spring – will cause soil movements that may cause roots to rip. During the day, soil will thaw, filling its pores with water; during the night this water will freeze and expand. This soil movement will damage roots and may cause them to rip. This will inhibit the plants’ uptake of water and nutrients, causing them to wither and even to die. Potassium and magnesium promote root development, allowing plants to recover and to balance damages as quickly as possible.

Korn-Kali®: for optimum frost protection

A sufficient supply of potassium and magnesium is indispensable for your crops’ resistance to frost. Even if under extreme weather conditions damages do occur, these nutrients will help plants to recover as quickly as possible. Autumn application of Korn-Kali® will optimally prepare crops for winter hardships. Korn-Kali® contains 40% potassium oxide (K2O), 6% magnesium oxide (MgO), 4% sodium oxide (Na2O) and 12% sulphur trioxide (SO3), in a fully water soluble form, which is immediately available to plants. Korn-Kali® is universally applicable, at any location.

More information on frost protection of plants:


Preventing Frost Damage: Potassium Will Help


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