The effects of foliar fertilizer application on the nutritional state, photosynthesis, carbohydrates, and fruit production of 'Valencia Late' orange (Citrus sinensis) in Tecolutla, Veracruz, Mexico, were studied. Orchards of 'Valencia Late' orange trees grafted onto C. aurantium were used. The treatments used were: (1) soil fertilizer application, (2) commercial foliar urea at 4%, (3) complete fertilizer; and (4) combined (1+2).