Magnesium deficiency - Barley

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Nutrients

Barley - Chlorosis

Symptoms
Proceeding from the leaf tip, older leaves become pale green with beading of chlorophyll (easy to reveal by holding leaf to sunlight). Striped appearence because of interveinal chlorosis. Small bright freckles spread over the leaf. Leaf tip shows beginning necrosis.

Reasons
Magnesium deficiency

Barley - Growth retardation

Symptoms
Older leaves become pale green with beading of chlorophyll. Chlorosis and Necrosis of leaf margins, proceeding from leaf tip, can be seen in more severe cases. Easy to reveal by holding leaf to sunlight.

Reasons
Magnesium deficiency Drought can also cause marginal necrosis.

Barley - Growth retardation

Symptoms
Older leaves become pale green with beading of chlorophyll. Chlorosis and Necrosis of leaf margins, proceeding from leaf tip, can be seen in more severe cases. Plant growth is stunted. Easy to reveal by holding leaf to sunlight.

Reasons
Magnesium deficiency Drought can also cause marginal necrosis.

Barley - Chlorosis

Symptoms
Leaves appear pale green with beading of the chlorophyll. Leaves with more severe Mg deficiency (centre) show leaf margin necrosis.

Reasons
Magnesium deficiency Drought can cause similar symptoms of margin necrosis.

Barley - Chlorosis

Symptoms
Affected leaves appear pale green with beading of the chlorophyll.

Reasons
Magnesium deficiency

Barley - Chlorosis

Symptoms
Affected leaves appear pale green with beading of the chlorophyll.

Reasons
Magnesium 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

Better crop establishment
Improved winter hardiness and tillering
Better grain quality

Yara recommended fertilisers for Magnesium

YaraVita GRAMITREL

Cereals: 1 to 3 l/ha from the 2 leaf stage to second node detectable (Zadok's G.S. 12 to 32). Repeat applications at 10 to 14 day intervals, within this timing, if necessary. For autumn sown crops, an application prior to winter dormancy may also be beneficial. In addition, 1 l/ha from second node detectable to flag leaf fully emerged (Zadoks G.S. 32 to 39). Water rate: 50 to 200 l/ha. Seed Dressing: 3 to 6 litres per tonne.

YaraVita MAGFLO 300

Cereals: 2-4 l/ha at 2 leaf stage to first node detectable (G.S. 12-31). For moderate to severe deficiency, repeat applications at 10-14 day intervals. 2 l/ha at flag leaf ligule just visible to anthesis complete (G.S. 39-69). Water rate: 200 l/ha.