Potassium deficiency does not immediately result in visible symptoms. Initially there is reduced growth, with chlorosis and necrosis occurring in older leaves in later growth stages. Older leaves show mottled or chlorotic areas with leaf burn at the margins, usually leaving the midrib alive and green.

 Click on an image for enlargement, plant ID, and photo credit.

K deficient alfalfa leafK deficient alfalfa leafK deficient alfalfa flowerK deficient wheat plant, image by IPNIK deficient wheat grain and leaves, image by PPIK deficient barley field on right, image by IPNIK deficient barley leaf tip, image by IPNIK deficient corn plant, image by PPIK deficient corn plant, image by PPIK deficient corn leaf tip, image by IPNIK deficient mature corn harvest on right K deficient potato leaves, image by PPIK deficient potato leaf, image by PPIK deficient canola leaf, image by PPIK deficient canola rosetteK deficient sugarbeet leaves, image by IPNI

Click on an image to view as a slideshow.