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This study was conducted under Lath House conditions at Department of Horticulture and Landscape Design, College of Agriculture and Forestry, Mosul University, during 2020 growing season, to know the effect of two factors and its combinations on some heavy metals concentrations in the leaves of Local orange (Citrus sinensis L.) transplants budded on soure orange (Citrus aurantium L.) cultivated on plastic pots filled with 8 kg of media (soil + sheep manuier 3:1). First factor was NPK fertilizer (20:20:20) which were added at two levels (0 and 30 gm.transplant). The second factor included five levels of biofertilizers (3 and 6 gm.Biogeain, 5 and 10 gm. Potasiomag and 1gm.Fulzyme.transplant) and Nutrigreen organic fertilizer at a concentration of 6 ml.l in respect to control. NPK fertilizer were added at two equal doses (15gm.transplant in each dose), at 21/3 and 2/5/2020 respectively, biofertilizers were added at 21/3/2020, the organic fertilizer were added at two times (26/3 and 3/5/ 2020) at the amount of 200 ml. in each time. Results indicated that all biofertilizers and organic fertilizer significantly decreased leaves Co, As, Se, Ag and Cr concentrations, While the application of NPK significantly increased leaves As concentration only as compared with control. The best treatment was 30gm NPK +10gm Potasiomag .transplant which gave the minimum concentrations of Co, Ag and Cr in the leaves, Meanwhile the minimum leaves As and Se concentrations was in the treatment of 0gm NPK + 10gm Potasiomag .transplant .

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EFFECT OF COMPOUND FERTILIZER NPK, LIQUID ORGANIC FERTILIZER NUTRIGREEN AND SOME BIOFERTILIZERS ON THE CONCENTRATION OF HEAVY METALS IN THE LEAVES OF LOCAL ORANGE TRANSPLANTS