Copper deficiency-Maize | Yara South Africa

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Nutrients

Maize - Chlorosis

Symptoms
The youngest leaves show yellow interveinal discoloration as they come out of the whorl. Mainly the basal part of the leaf is uniformly yellowgreen.

Reasons
Mild Copper deficiency Copper deficiency in corn is rarely seen. N + S deficiency and cool weather produce symptoms similar to mild copper deficiency. Leaf streaking can be similar to Fe deficiency.

Copper deficiency made worse by

Organic soils
Chalky soils
Sandy soils
Reclaimed heathland
High nitrogen applications

Copper is important for

Improves fertility
Good cob development
Improves yield
Brings harvest date forward

Yara recommended fertilizers for Copper

YaraTera CHELATE 1089

Maize: Apply 2 kg/ha before planting (can be coated on pre-plant fertilizers) and a further 1 kg/ha at 3, 5, 7 weeks after planting.

YaraTera CHELATE 1090

Maize: Apply 2 kg/ha before planting (can be coated on pre-plant fertilizers) and a further 1 kg/ha at 3, 5, 7 weeks after planting.

YaraTera REXOLIN Cu15

YaraVita COPTRAC 500

Maize: 0.5 l/ha at the 4 to 8 leaf stage. Water rate: 75 to 200 l/ha. Seed Dressing: 4 litres per tonne.

YaraVita MAIZE PHOLATE

Maize: 1 to 3 kg/ha at the 4 to 6 leaf stage. Also, 1 kg/ha just prior to flowering. Water rate: Tractor Driven Sprayer - 200 l/ha. Application through Irrigation System - 100,000 l/ha.

YaraVita MANCOZIN

Maize: 0.5 to 1.0 l/ha at 4-8 leaf stage. Water rate: 75-200 l/ha.

YaraVita TRI-PHOLATE

Maize: Apply 2-3 kg/ha at 4-6 leaf stage. Apply a further 1 kg/ha just prior to flowering. Water rate: 200 l/ha for tractor driven sprayer. 100,000 l/ha for application through irrigation system.