Potassium Deficiency

scouted June 3, 2024

Soybeans were scouted at the V5 growth stage and yellowing of lower (older) leaf margins were observed. Damage observed was widespread and consistent.
This issue was confirmed by an NC State Extension Specialist as a Potassium (K) Deficiency. Yellowing of leaf margins, stunted plants, and slow growth can be associated with a potassium deficiency. Soybeans require a high amount of potassium, and uptake of K is driven by diffusion. In an environment of droughty conditions, a K deficiency may be seen. A potassium deficiency may also be observed through leaching in an environment with coarse textured soil. The best way to ensure and maintain the correct nutritional needs for a field is to conduct soil sampling every 1 to 2 years.

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