Oilseed Rape - Chlorosis
Symptoms
Mn deficiency occurs initially on the younger leaves. Chlorosis develops between the veins, while a narrow area on each side of the veins remains green. As the small veins remain green as well, a mosaic-shaped pattern appears.
Causes
Light Manganese deficiency
Can be confused with Fe deficiency, which has very similar symptoms on younger leaves. If Fe is lacking, the interveinal chloroses always start on the youngest leaves, while at Mn deficiency the very young leaves can keep an olive green colour in the beginning.
Mg deficiency also shows intercostal chlorosis and necrosis, but the symptoms start on older leaves.
Oilseed Rape - Chlorosis
Symptoms
Manganese deficiency occurs initially on the younger leaves. Chlorosis develops between the veins, while a narrow area on each side of the veins remains green.
Causes
Manganese deficiency
Can be confused with Fe deficiency, which has very similar symptoms on younger leaves. If Fe is lacking, the interveinal chlorosis always start on the youngest leaves, while at Mn deficiency the very young leaves can keep an olive green colour in the beginning.
Mg deficiency also shows intercostal chlorosis and necrosis, but the symptoms start on older leaves.
Manganese deficiency made worse by
- Organic soils
- Sandy soils
- High pH
- Cold wet periods
- Fluffy soils
Manganese is important for
- Better crop establishment and reduced plant losses over winter
- Increases nutrient levels in the crop for better spring regrowth
- Improved flowering and more even maturity
- Boosts grain yield and oil content of seed
Yara recommended fertilisers for Manganese deficiency
YaraVita BRASSITREL PRO
Oilseed Rape: 3 to 4 l/ha at the 4 to 9 leaf stage and again at the onset of the rapid stem extension phase up to the start of flowering. Repeat at 10 to 14 day intervals within these growth stages as necessary. Also, 3 l/ha at the end of petal fall. Water rate: 50 to 200 l/ha.
Read more about YaraVita BRASSITREL PROYaraVita MANTRAC PRO
Oilseed Rape: For a single application, 1 l/ha at onset of stem elongation. For moderate deficiency, 1 l/ha at 4-6 leaf stage and at stem extension. For severe deficiency an extra application can be made 10-14 days later. Water rate: 200 l/ha. Seed Dressing: Up to 22 litres per tonne.
Read more about YaraVita MANTRAC PRO
