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Potassium nitrate, potassium sulfate and potassium acetate were applied as foliar sprays at recommended rates for each material to Empire and McIntosh apple trees in a potassium deficient orchard. Five sprays of each material were applied at approximately one-week intervals beginning in mid-August All sprays were applied by means of a small air-blast sprayer calibrated to deliver 800 1 ha -1  of a 1.744X tank mix, i.e. equivalent to dilute sprays of 1400 1 ha -1 . Total amounts of K applied per ha were 8.6 kg with K-acetate and 28 kg ha -1  with K-nitrate and K-sulfate. Leaf samples were collected from each plot at normal harvest date for each variety and washed prior to drying and analysis. Regression analysis indicated a significant (P=0.05) positive relationship, r = +0.4740, between total amount of K applied and leaf K regardless of the source. Significant positive relationships were found between average fruit weight and percent leaf potassium with both varieties.

261 ALTERNATIVE SOURCES FOR FOLIAR APPLICATION OF POTASSIUM TO APPLE TREES