Nutrients

P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
S Sulfur
B Boron
Fe Iron
Mn Manganese
Zn Zinc

Apples - Chlorosis

Symptoms
Leaves develop inteveinal necrosis or necrotic blotches from midrib area on older leaves first

Reasons
Magnesium deficiency Potassium deficiency perhaps produces similar symptoms, but starts at leaf margins.

Apples - Chlorosis

Symptoms
Symptoms appear first as chlorosis between the main veins, starting on older leaves. Then develop to interveinal necrosis or necrotic blotches along the main vein. Often leaf margin remain green. Apple and other fruits sometimes right away develop necrosis without preceding chlorosis.

Reasons
Magnesium deficiency Potassium deficiency perhaps produces similar symptoms, but starts on the leaf margins.

Apples - Chlorosis

Symptoms
Symptoms appear first as chlorosis between the main veins starting on older leaves. Then develop to interveinal necrosis or necrotic blotches along the main vein. Often leaf margin remain green. Apple and other fruits somtimes right away evolve necrosis without preceding chlorosis.

Reasons
Magnesium deficiency Potassium deficiency perhaps produces similar symptoms, but starts at leaf margins.

Apples - Necrosis

Symptoms
Symptoms appear first as chlorosis between the main veins starting on older leaves. They develop to interveinal necrosis or necrotic blotches along the main vein. Often leaf margins remain green. Apple and other fruits sometimes evolve necrosis without preceding chlorosis.

Reasons
Magnesium deficiency Potassium deficiency perhaps produces similar symptoms, but starts at leaf margins.

Magnesium deficiency made worse by

  • Sandy soils
  • Acidic soils
  • Potassium rich soils
  • Soils receiving high potash applications
  • Cold wet periods

Magnesium is important for

  • New growth maintained green and vigorous
  • Fruit number and retention increased
  • Fruit size may be increased
  • Yields are greater

Yara recommended fertilizers for Magnesium

YaraVita BUD BUILDER FL

YaraVita BUD BUILDER FL

Apple: 10 l/ha applied post-harvest before leaf fall. Water rate: 500 to 1000 l/ha.

Read more about YaraVita BUD BUILDER FL

YaraVita MAGFLO 300

YaraVita MAGFLO 300

Apple: 3 to 4 l/ha applied from 4 weeks after petal fall and repeated if necessary at 10 to 14 day intervals up to one month before harvest. Also, 5 l/ha after harvest but before leaf senescence. Water rate: 500-1000 l/ha.

Read more about YaraVita MAGFLO 300

Other recommended products

YaraVita EZY-Mg PLUS
Apple: 3 l/ha from 4 weeks after petal fall. Apply 2 to 6 treatments depending upon the severity of the deficiency at 10 day intervals. Water rate: 500-1000 l/ha. N.B. Do not exceed a maximum concentration of 2 litres per 100 litres water.
YaraTera KRISTA MAG
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YaraTera KRISTA MgS
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