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Effect of foliar bio-fertilization on growth and biochemical parameters of olive trees at flowering

Dabbaghi, Olfa, Tekaya, Meriem, M'barki, Naouraz, Ouled ali, Sarra, Öden, Sevgi, Mezghani, Mouna Aïachi, Attia, Faouzi, Labidi, Foued, Prinsen, Els, Hammami, Mohamed, Mechri, Beligh
Journal of plant nutrition 2018 v.41 no.18 pp. 2281-2297
Olea europaea, biofertilizers, calcium, enzyme activity, fertilizer application, flower buds, flowering, leaves, nitrogen, olives, phenylalanine, phosphorus, polyphenols, potassium, sodium, trees
Growth and biochemical parameters of leaves, flower buds and flowers of olive (Olea europaea L. cv. Chemlali) treated by foliar biofertilization (T0: untreated trees; T1: rich in nitrogen (N), phosphorus (P), potassium (K); T2: rich in calcium (Ca); T3: application of T1 and T2) were analyzed during the flowering stage. The results showed that T1 resulted in higher contents of leaf N, K, and Na. T1 and T3 resulted in an increase of pigment concentration in leaves. All foliar treatments affected negatively the contents of total polyphenols and orthodiphenols in leaves and flower buds. Lower amounts of individual phenolic compounds were detected in the leaves under all foliar bio-fertilizations and in flower buds of olive trees sprayed with T2 and T3. This decrease is explained by the lower enzymatic activity of l-phenylalanine ammonia-lyase. In flowers, T1 exhibits the highest levels of total polyphenols, o-diphenols, and individual phenolic compounds compared to T0.