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The P&PDL Picture of the Week

Classic K Deficiency in Corn

Photos and Information by Silvia Brouder, Agronomy Department

(Click on smaller image to view larger image.)

Two leaves showing classic K deficiency Close-up of V10 Corn in field K deficient corn (left) and normal corn (right) in field

Corn at V10
Classic symptoms of K deficiency - Marginal chlorosis and necrosis of lower leaves

V10 in the field Corn at V10:
Other signs that K may be limiting - the corn is shorter than expected (soil test K for the rows on the right is 100 ppm (200 lb/A) while the soil test K for rows on the left is 150 ppm (300 lb/A)
K deficiency and normal corn stalks Unopened ears of corn K deficient ears compared with normal ears of corn
K deficient corn (top) may have ears lower on the stalk And while unopened ears appear to be the same size... K deficient ears may be shorter with fewer rows of kernels - the lower height of the ear can be due to K deficient plants have one or more fewer internodes below the ear and/or shorter internode differences.

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Last updated: 14 August 2001/tlm.
The Plant & Pest Diagnostic Laboratory at Purdue University.