Manganese deficiency-Apples | Yara South Africa

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Nutrients

Apples - Chlorosis

Symptoms
Symptoms start at young, fully developed and medium leaves. They show yellow green or yellow interveinal chlorosis. Veins and streaks along the veins remain green. Sometimes leaves look like a mosaic, because also fine veins remain green. Later necrotic spots, sometimes white in colour, and necrotic blotches appear.

Reasons
Manganese deficiency

Apples - Chlorosis

Symptoms
Symptoms start at young, fully developed and medium leaves. They show yellow green or yellow interveinal chlorosis. Veins and adjacent tissue remain green. Sometimes leaves look like a mosaic, because also fine veins remain green. Later necrotic spots, sometimes white in colour, and necrotic blotches appear.

Reasons
Manganese deficiency

Manganese deficiency made worse by

Organic soils
Sandy soils
High pH
Cold wet periods
Fluffy soils

Manganese is important for

Vigorous shoot and leaf growth
Fruit quality and yield may be improved

Yara recommended fertilizers for Manganese

YaraVita MANTRAC PRO

Apple: 100 to 200 mls per 100 l water to give an input of 2 l/ha per application, which is both the desired and the maximum application per hectare. Apply prior to flowering in the case of severe deficiency. Otherwise commence at petal fall and repeat 10 to 14 days later. Also, apply after harvest before leaf senescence. Water rate: Sufficient to provide good cover but to just before the point of run-off.