OVERCOMING IRON CHLOROSIS IN OLIVE AND PEACH-TREES USING A LOW-PRESSURE TRUNK-INJECTION METHOD

Chlorotic 'Manzanillo' olive(Olea europaea L.) trees and 'Maycrest' pe ach [Prunus persica (L.) Batsch] trees were injected with Fe solutions using an apparatus that consisted of a plastic injector and a pressur ized latex tube containing the solution to be injected. Injections wer e made on various dates from Sept. 1987 to July 1988. All treatments i ncreased chlorophyll content compared to that of the control. Ferrous sulfate was the most effective Fe compound in alleviating chlorosis; i ts effect lasted for two seasons in peach and for at least three seaso ns in olive. Also, ferrous sulfate increased vegetative growth and aff ected cropping the year following injections. Ferrous sulfate at 0.5 % to 1 % is recommended to reduce the risk of foliar burning. The injec tion method effectively introduced Fe compounds into olive and peach t rees.