Iron deficiency-Potatoes | Yara South Africa

Symptoms
Fe deficiency is marked by pale green and yellow color of the youngest leaves, while the veins remain darker green (intercostal chlorosis). Sometimes the youngest leaves contain no chlorophyll at all and are white in color then.

Reasons
Iron deficiency Iron deficiency mainly occurs in calcareous soils and in other soils with a high pH-value due to the low availability of Fe. In specific clay soils Fe becomes fixated and deficiency is the consequence.

Iron deficiency made worse by

High pH
Water logged soils
Calcareous soils
High copper, manganese or zinc soils

Iron is important for

Essential for photosynthesis and plant metabolism
Thus important for early leaf development, strong growth and crop productivity

Yara recommended fertilizers for Iron

YaraTera CHELATE 1089

Potatoes: Apply 2 kg/ha before planting (can be coated on pre-plant fertilizers) Apply a further 1 kg/ha at 3, 5, 7 weeks after planting. Can also be applied as a foliar application: Up to 150 g/100L water.

YaraTera CHELATE 1090

YaraTera REXOLIN E13

YaraTera REXOLIN Q48

YaraVita TRI-PHOLATE

Potatoes: Apply 2 kg/ha 1 week after 100% emergence. Apply a further 2 kg/ha at tuber initiation and a final 2 kg/ha at flowering. Water rate: 200 l/ha for tractor driven sprayer. 100,000 l/ha for application through irrigation system.