o:9886 Effect of Organic Fertilization on Macro– and Microelement Contents in Leaves and Fruits of Red Currant (Ribes rubrum L.) en Abstract: This study was conducted over a four–year period (2019–2022) in an experimental red currant (Ribes rubrum L.) orchard to examine the effect of organic fertilization on the contents of macroelements (C, N, P, K, Ca, Mg, S) and microelements (Fe, Mn, Cu, Zn, B) in the leaves and fruits. Two organic fertilizers were applied: well–decomposed cattle manure (CM) at 60 t ha⁻¹, and pelletized poultry manure (PPM, ‘Italpollina’, NPK 4:4:4) at 1.6 t ha⁻¹. The study evaluated nutrient balance using the Deviation from Optimum Percentage (DOP) index in two cultivars, ‘Rolan’ and ‘Jonkheer van Tets’. In 2021, no differences in balance of macronutrient were observed between cultivars; however, in 2022, ‘Rolan’ exhibited a higher imbalance than ‘Jonkheer van Tets’. ‘Rolan’ showed greater imbalance for micronutrients in 2021, whereas in 2022 the opposite trend was recorded, with ‘Jonkheer van Tets’ showing higher ΣDOP values. Fertilization treatment affected nutrient balance, with CM causing the highest macro- and micronutrient nutrient differences in 2022, while PPM promoted a more moderate and stable nutrient status. The greatest differences were observed in the R–CM treatment. The findings highlight the importance of selecting appropriate fertilizer to maintain nutrient balance and optimize red currant cultivation. cattle manure; macroelements; microelements; organic fertilization; pelletized poultry manure; red currant 1552099 10.15835/nbha54215158 2026-07-01T07:10:53.882Z 44 no 46 Marina Jovković Institute of Soil Science 0000-0001-7224-8556 46 Jelena Pavlović Institute of Soil Science 0000-0001-9424-1080 46 Jelena Tomić 46 Mira Milinković Institute of Soil Science 0000-0001-5175-6842 46 Radmila Ilić 46 Ljiljana Bošković-Rakočević 46 Aleksandra Stanojković-Sebić Institute of Soil Science 0000-0002-5176-9827 46 Ivan Glišić 46 Jelena Mašković 46 Gorica Paunović application/pdf 776341 https://unilib.phaidrabg.rs/o:9886 no yes 1 70 92000001 71A05 Notulae Botanicae Horti Agrobotanici Cluj-Napoca 54(2):15158 2026