Low Soil Moisture And Compaction Promote Potassium Deficiency

Low soil moisture and compaction slow crop uptake of potassium (K), often resulting in K deficiency. Potassium deficiency will be worse under these conditions at marginal to sub-optimal soil test K levels. Symptoms are yellowing and browning along the edges of older plant tissues during vegetative growth in corn and soybean. After flowering, symptoms may appear on upper leaves of soybean. Tissue sampling and analysis can be used to confirm K deficiency, with levels below 1.75-2.0% K likely deficient. Although, the recent rains will enable greater K uptake, symptoms that are present now will not disappear. Foliar K applications can be effective at increasing yield with severe deficiency, but are generally expensive and have risk of tissue burn. Areas showing deficiency should be soil sampled to determine if low soil test and/or compaction were responsible for inadequate K uptake. Soil test levels less than 100-125 parts per million or 200-250 pounds per acre are considered marginal to sub-optimal for most soils. Fertilizer applications and/or tillage should alleviate or at least lessen the potential for K deficiency next season.


K deficiency corn

K deficiency corn


K deficiency Soybean

K deficiency soybean


Share This Article
It is the policy of the Purdue University that all persons have equal opportunity and access to its educational programs, services, activities, and facilities without regard to race, religion, color, sex, age, national origin or ancestry, marital status, parental status, sexual orientation, disability or status as a veteran. Purdue is an Affirmative Action Institution. This material may be available in alternative formats. 1-888-EXT-INFO Disclaimer: Reference to products in this publication is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in this publication assumes full responsibility for their use in accordance with current directions of the manufacturer.
Pest&Crop newsletter - Department of Entomology Purdue University 901 Mitch Daniels Blvd West Lafayette, IN 47907

© 2024 Purdue University | An equal access/equal opportunity university | Copyright Complaints | Maintained by Pest&Crop newsletter

If you have trouble accessing this page because of a disability, please contact Pest&Crop newsletter at luck@purdue.edu.