engleski

Manganese soil and foliar fertilization of olive plantlets : the effect on leaf mineral and phenolic content and root mycorrhizal colonization

The present study aimed to examine the effect of foliar (Mn_fol) and soil Zeolite- Mn (Mn_ZA) application on leaf mineral, total phenolic and oleuropein content, andmycorrhizae colonization of self-rooted cv. Leccino plantlets grown on calcareous soil. The dissolution of zeolite was 97% when citric acid was applied at 0.05mMdm−3, suggesting that organic acids excreted by roots can dissolvemodified zeolite (Mn_ZA), making Mn available for plant uptake. The leaf Mn concentration was the highest for Mn_fol treatment at 90 days after transplanting (DAT) (172mgkg−1) and 150 DAT (70mgkg−1) compared to other treatments. Mn_ZA soil application increased leafMn concentration at 150 DAT compared to control and NPK treatments. The oleuropein leaf content was highest forMn_fol compared to other treatments at 90 DAT and lowest at 150 DAT. Arbuscular mycorrhizal colonization was higher forMn_fol treatment at 150 DAT compared to all other treatments. Changes in the arbuscular colonization percentage and oleuropein contentmay be connected to stress conditions provoked by a high leafMn concentration in theMn_fol treatment at 90DAT.Mn_ZAapplication increased leafMn concentration at 150 DAT compared to control and NPK treatments. It can be assumed that the dominant mechanism in Mn uptake from modified zeolite isMn_ZA dissolution through root exudates.

arbuscular mycorrhizal fungi ; calcareous soil ; citric acid ; Olea europaea L. ; zeolite A

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