Foliar micronutrient applications enhance growth and yield of huanglongbing (HLB)?affected sweet orange

Florida citrus production has declined by more than 70% because of Huanglongbing (HLB), and a major cause tree decline is nutrient uptake limitations caused HLB. This study was conducted on 6–9-year-old “Valencia” sweet orange [Citrus sinensis (L.) Osbeck] Swingle rootstock in the central southwest to evaluate effects macronutrient fertilization foliar application Mn Fe growth yield HLB-affected trees Florida. Seven treatments, including control (standard fertilization), two levels macronutrients (1× Macro 2× Macro), three micronutrients (F-1×, F-2×, F-4×), were arranged randomized complete block design locations for 3 years. Trees subjected 1× + F-4× showed highest average leaf concentration both sites through all The treatment that contained F-2× at least 4% increase canopy volume 2020 2021 site. However, 12% In 2021, F-1× resulted 15% greater efficiency treated with increased sites. general, parameters results treatments supplemental over current recommendations have strong potential yield.