Manganese deficiency-Wheat | Yara South Africa

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Nutrients

Cereals - Growth retardation

Symptoms
Leaves of Mn deficient plants show chlorotic spots and streaks which turn gray-white to brown and coalesce. Symptoms appear on younger and central leaves. Leaves are kinked or bend down when the spotting is intense. Plant growth is stunted.

Reasons
Manganese deficiency Mn deficiency is enhanced by cool, dry weather.

Cereals - Growth retardation

Symptoms
Light green areas within the stand indicate affected plants. The tramlines are not concerned. Because of the soil compaction the manganese is better available in these areas.

Reasons
Manganese deficiency Characteristic symptoms of Mn deficiency are the dark green tractor lanes within the chlorotic area. Here the soil is compressed and less Mn oxidation occurs. It is common that Mn deficiency chlorosis occurs in irregular patches within the stand. The chlorotic mottling is seen first on youngest fully expanded leaves. The susceptibility for manganese deficiency raises with high pH, high humus content, loose soil structure. Often occurs in early spring as it is too cold for manganese deoxidizing bacteria.

Cereals - Chlorosis

Symptoms
Young leaves of Mn deficient plants show chlorotic spots and streaks which turn brown to gray-white and coalesce. Strongly affected leaf blades bend.

Reasons
Manganese deficiency

Cereals - Chlorosis

Symptoms
Mn deficient plants show chlorotic spots and streaks which turn brown/gray-white, coalesce and may expand over the older leaves. Strongly affected leaf blades bend.

Reasons
Manganese deficiency It is characteristic that Mn deficiency chlorosis occurs in irregular patches within the stand. The chlorotic mottling is seen first on youngest fully expanded leaves. The susceptibility for manganese deficiency raises with high pH, high humus content, loose soil structure. Often occurs in early spring as it is too cold for manganese deoxidizing bacteria.

Cereals - Deformation

Symptoms
Leaves have grey specks or light brown lesions and they break/bend over near the centre section. Some leaves show signs of chlorosis which eventually hides the lesions.

Reasons
Manganese deficiency (Grey speck) May be confused with applications of pesticides or foliar fertilisers.

Cereals - Chlorosis

Reasons
Manganese deficiency Mn deficiency is enhanced by cool, dry weather.

Cereals - Chlorosis

Reasons
Manganese deficiency Mn deficiency is enhanced by cool, dry weather.

Cereals - Chlorosis

Reasons
Manganese deficiency Mn deficiency is enhanced by cool, dry weather.

Manganese deficiency made worse by

Organic soils
Sandy soils
High pH
Cold wet periods
Fluffy soils

Manganese is important for

Better crop establishment
Improved winter hardiness and tillering
Improved disease resistance
Better grain quality

Yara recommended fertilizers for Manganese

YaraTera REXOLIN Mn13

YaraVita MANTRAC PRO

Cereals: 0.5 to 2 l/ha from 2 leaf stage to second node detectable (Craven 1 - 10/11). For moderate to severe deficiency repeat applications at 7 to14 day intervals. Water rate: 30 to 200 l/ha. Seed Dressing: Typical rate 3 litres per tonne. Also, up to 6 litres per tonne if necessary.

YaraVita TRI-PHOLATE

Cereals: 3 kg/ha from 4 leaf stage to 1st node detectable (Craven 4 - 10/11). Repeat within this timing at an interval of not less than 10 days, if necessary. Water rate: Tractor driven sprayer: 200 l/ha Application through irrigation system: 100,000 l/ha.

YaraVita WHEAT PHOLATE

Cereals: 3 kg/ha at the 4 to 6 leaf stage. Water rate: Tractor driven sprayer: 200 l/ha Application through irrigation system: 100,000 l/ha.

Other recommended products

YaraVita MANCOZIN

Cereals: 0.5 to 1 l/ha from 2 leaf stage to first node detectable (Craven 1 - 10/11). Water rate: 200 l/ha. For severe deficiency, increase to 2 l/ha or repeat the above dose 10 to 14 days later.