Nutrient Disorders

Guy Padgett  |  8/20/2011 12:21:06 AM

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Potassium Deficiency

Potassium Deficiency

Potassium deficiency.

Soybeans require large amounts of potassium, especially during periods of rapid vegetative growth. Potassium influences plant growth, and nutritional balance of the plant. Deficiencies can be induced by heavy applications of other nutrients such as calcium.

Symptoms of potassium deficiency include chlorosis of the leaf margins which may eventually encompass half the leaf, leaving only the base green. The yellow areas coalesce and become necrotic followed by downward cupping of the leaf margins. The dead tissue may shread and give the leaf a ragged appearance. Severely deficient plants produce wrinkled or misshapen seeds. Some cultivars show leaf hopper injury that mimics potassium deficiency.

Potassium deficiency can be corrected by applying fertilizers that contain potassium. A soil test should be used to determine the correct amount of potassium to apply.

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