Magnesium deficiency-Onions | Yara New Zealand

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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 MAGFLO 300

Onions: 4 l/ha when there is sufficient leaf area to intercept spray. Repeat application as necessary. Water rate: 50-200 l/ha.

Other recommended products

YaraVita MAGPHOS K

Onion: 5 l/ha. Apply when the foliage is 15cm tall, with a second application 10 to14 days later if necessary. Also,1 to 2 applications of 5 l/ha during bulb filling, with a 10 to 14 day interval between sprays. Water rate: 30 to 200 l/ha.

YaraTera KRISTA MAG

YaraTera KRISTA MgS