Magnesium deficiency-Onions | Yara United States

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Nutrients

Onions - Growth retardation

Symptoms
Older leaves turn completely yellow along their entire length due to lack of chlorophyll. With progressing deficiency, browning and dieback of leaf tips will follow. Plant growth is considerously inhibited.

Reasons
Magnesium Deficiency

Onions - Growth retardation

Reasons
Magnesium Deficiency

Onions - Growth retardation

Symptoms
The outer leaves show striped interveinal chlorosis, followed by tip-burn and necrosis. Growth is inhibited.

Reasons
Manganese Deficiency Onions are very susceptible to Mn deficiency.

Magnesium deficiency made worse by

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

Magnesium is important for

Chlorophyll production
Improves shelf life by reducing rot

Yara recommended fertilizers for Magnesium

YaraVita® MAGPHOS™

Onions: 1-2 quarts/acre. Apply when the foliage is 6" tall, with repeat applications 10 to 14 day intervals if necessary. Water rate: 3 to 20 gallons/acre.

YaraVita® MAGTRAC™

Onions: 1-2 quarts/acre two weeks after transplanting, or in the case of direct sown crops, when the crop is 6" tall. Repeat applications at 10 to 14 day intervals. Water rate: 3 to 20 gallons/acre.