Abstract
Yield of fruit, fruit quality, and mineral composition of the leaves of ‘Valencia’ orange [Citrus sinensis (L.) Osb.] were essentially unchanged by widely different schedules of applying N and K. Single annual applications of NH4NO3 were made in fall, spring, or summer. Applications of KCl were made twice yearly, annually in fall or spring, or biennially in alternate springs. Two rates of N maintained average leaf levels of about 2.6 and 2.7%. A yield increase accompanied the higher level of N. Similar responses occurred on ‘Rough’ lemon (C. jambhiri Lush.) and ‘Cleopatra’ mandarin (C. reticulata Blanco) rootstocks.

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