Potassium deficiency-Apples | Yara New Zealand

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Nutrients

Apples - Chlorosis

Symptoms
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.

Reasons
Potassium deficiency Frost and drought can cause similar symptoms

Apples - Necrosis

Symptoms
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.

Reasons
Potassium deficiency Frost and drought can cause similar symptoms

Potassium deficiency made worse 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

Potassium is 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

Yara recommended fertilizers for Potassium

YaraVita CROPLIFT-K

Apple: 5 kg/ha at 10 to 14 day intervals as required commencing 4 weeks after petal fall. If necessary, also apply post-harvest before leaf fall. Water rate: 500-1000 l/ha.

Other recommended products

YaraVita CROPLIFT

Apple: 5 kg/ha at 10 to 14 day intervals as required commencing 4 weeks after petal fall. If necessary, also apply post-harvest before leaf fall. Water rate: 500 to 1000 l/ha.

YaraMila COMPLEX

YaraTera KRISTA K PLUS

YaraTera KRISTA MKP

YaraTera KRISTALON BLUE

YaraTera KRISTALON ORANGE

YaraTera KRISTALON RED

YaraTera KRISTALON WHITE

YaraTera KRISTALON YELLOW