Basics
Symptoms
Scouting
Agronomic impact
Risk assessment
Management
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NCSRP

Founded by the North Central Soybean Research Program and funded by the Soybean Checkoff – this website provides information on soybean pests and diseases from checkoff-funded research, and from the university research and Extension programs of all 12 NCSRP partner states.

 

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Iron Deficiency Chlorosis - Symptoms

 

IDC
Iron deficiiency can look similar to potassium deficidency.
From: Is it potassium or iron deficiency? Iowa State University Entomology Image Gallery

Leaves

Symptoms appear on the youngest upper leaves. The leaves are yellow, with the veins remaining green. The older trifoliolate leaves remain green.If deficiency persists or is severe, leaves turn white and plant growth is stunted.

The intensity of chlorosis may increase or diminish during the growing season, depending on growing conditions and changes in soil chemistry. The symptoms are more pronounced when soil temperature is low and moisture is high.

 

Roots

Root rot often occurs on plants suffering from iron chlorosis. This is thought to be due to the increased susceptibility of chlorotic plants to root pathogens. Cysts of soybean cyst nematodes, which are favored in high pH soils, are often found on plants showing iron chlorosis symptoms.