The Relation of Nitrogen to Potassium in the Nutrition of Fruit Trees

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Abstract
Observations were made on the foliage of Delicious apple trees fertilized with nutrient solutions containing various N/K ratios. When the amount of nitrogen was reduced to one-third of that in the complete-nutrient solution, the development of leaf scorch was retarded and the amount reduced below that of all other cultures receiving additional N. Increasing the amount of K in the complete-nutrient solution was also effective in preventing development of leaf scorch, being just as effective as the reduction of N. Decreasing the amount of K or increasing the amount of N in the nutrient solution was conducive to leaf scorch. Data on the K, N, and carbohydrate content of the leaves, 1-yr. wood, and 2-yr. wood are presented. No correlation was found between the carbohydrate content of the plants and their N/K ratio. In general the response of the plants to K deficiency seemed to vary with the N content.

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