Leaf Analysis as a Guide for Potassium Nutrition of Potato12

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Abstract
“White Rose” potato plants were grown in modified Hoagland’s solution at concentrations of 0 to 16 meq/1 of K. After 32 days of growth, 16 plant parts were taken for analysis. The K status of the potato plant was reflected best by the second leaf below the flat top (Fig. 1). This leaf was the recently matured leaf of the plant, was relatively easy to sample, and did not differ greatly in K concentration from the first, third, and fourth leaves. The critical K value at a 10% reduction of growth was 2.3% for the petiole tissues and 1.1% for the blade tissues.

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