Corn leaf potassium deficiency symptoms

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2002-07-01
Authors
Sawyer, John
Mallarino, Antonio
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Integrated Crop Management News
Extension and Experiment Station Publications
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Abstract

Potassium (K) leaf deficiency symptoms have recently appeared in some cornfields. Early-season symptoms typically show when corn begins rapid growth, calf to knee-high (V6-V8 growth stages), and the K uptake rate accelerates as plant demand responds to this rapid growth. Because K is maintained in the plant in the K+ ion form, it is readily moved from older tissue to the growth regions, hence deficiency symptoms appear on the older leaves. On corn, symptoms show as yellowing to necrosis of the leaf margins on older leaves.

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Tue Jan 01 00:00:00 UTC 2002
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