Potassium Deficiency - Apple

Symptom description

Old leaves bluish-green with scorched margins (brown or grey). Margins may first appear light green and later turn necrotic. Necrosis progresses from the margins inward to the midrib.

Made worst by

Acidic soils (low pH). Sandy or light soils (leaching). Drought conditions. High rainfall (leaching). or heavy irrigation. Heavy clay (illite) soils. Soils with low K reserves. Magnesium rich soils.

Important for

New growth is healthy. Cold hardiness is improved. Flower number increases. Fruit are longer and are generally more intensely coloured. Fruit may mature earlier and have improved flavour. Yields are increased.

Cause description

Potassium deficiency Frost and drought can cause similar symptoms