N and K Fertilization Effects on Leaf Analysis, Tree Size, and Yield of Three Major Florida Orange Cultivars1

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Abstract
A 5-year field experiment planted on Astatula fine sand using ‘Hamlin,’ ‘Pineapple,’ and ‘Valencia’ orange (Citrus sinensis [L.] Osbeck) on rough lemon rootstock (Citrus jambhiri Lush.) with 4 levels each of N and K indicated that higher N rates increased fruit production and yield of soluble solids. High K applications decreased soluble solids. Increase in tree canopy area between 1968 and 1974 was related to N but not to K applications. Maximum yield response with N in all 3 cultivars was attained at 202 kg/ha/yr. ‘Hamlin’ orange showed maximum yield response to K at 167 kg/ha/yr whereas ‘Pineapple’ and ‘Valencia’ orange had maximum yield at 112 kg/ha/yr. Leaf analyses showed that increased N application resulted in higher leaf N and Mg contents but lower P and K levels. Increased K application showed higher P and K levels but lower Ca and Mg levels.

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