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Zinc Deficiency in Corn and Dry Bean
Corn and dry bean are sensitive to low soil zinc levels. Zinc deficiency in corn is characterized by a general yellowing of the plant with yellow to white striping on the leaves between the midrib and the leaf edge. Zinc deficiency symptoms are more likely early in the season. Other problems may cause yellowing and striping, so it is desirable to check out other causes before spraying with a foliar zinc treatment. Zinc deficiency in dry bean may cause yellowing in leaves which turn to brown, necrotic areas as the condition ages. Leaf yellowing usually affects the veins as well as the leaf tissue. To verify a zinc deficiency, soil testing or leaf analysis can be used. A fertilizer history is also helpful, especially in corn. To correct a deficiency, a zinc sulfate solution consisting of 2 lbs/a of zinc sulfate applied in 10-20 gallons of water per acre will usually correct the problem. Zinc chelates and ammoniated zinc products can also be used, using manufacturers recommendations.
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