Potassium (K) deficiency symptoms are beginning to be observed on many corn fields and in some soybean fields. The symptom for both crops is yellowing of the leaf margins of the older leaves that usually begins at the leaf tip and extends down the margins toward the leaf base. With severe deficiency the leaf edges may become brown (the tissue dies) and affected plants will appear stunted, although the newest leaves may be normal. For further information of symptoms, see ICM 7/1/2002 (“Corn leaf potassium deficiency symptoms”) and ICM 7/1/2002 (“Is it iron or potassium deficiency?”). Questions usually arise at this time about reasons for a deficiency and what can be done to alleviate yield loss.
Mallarino, Antonio P., "Potassium deficiency symptoms in corn and soybean: What can we do about them?" (2005). Integrated Crop Management News. 2380.
The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit https://crops.extension.iastate.edu/.