Six potassium treatment combinations were evaluated. Treatments were twenty-five pounds of K applied preplant and a control. Foliar application of five pounds at first square and the untreated control were evaluated in both combinations of preplant fertilizer. Five pounds of foliar K at peak bloom was applied and the untreated control in the treatments that received an earlier foliar application of K. The results supported the soil test recommendation of twenty-five pounds of potassium per acre. The data did not support the foliar application of potassium.

The varieties responded as expected except that BXN47 had much lower levels of petiole potassium than its close relative, STV474.