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Nitrogen at 112 and 224 kg·ha -1  and K at 0, 56, 112, 168, and 224 kg·ha -1  were applied to young `Desirable' pecan  [Carya illinoensis  (Wangenh.) C. Koch] trees to evaluate their influence on leaf scorch. Scorch severity in the orchard decreased with time even though large imbalances of N and K existed. Scorch was increased only slightly by the high N and the zero K treatments. Little scorch was observed in trees receiving K applications. Increasing K rates &gt;56 kg·ha -1  did not reduce scorch. Correlation was not significant or very weak for leaf N, leaf K, or the leaf N: K ratio with leaf scorch in the Ray City, Ga. study, depending on the year of observation. Another study at Tifton, Ga., revealed no correlation between scorch and leaf K or the leaf N: K ratio. A very weak correlation occurred for scorch and leaf N in 1 of 2 years.

Pecan Leaf Scorch in Response to Various Combinations of Nitrogen and Potassium Fertilization