ArticleFrontiers in plant science2026
Controlled-release fertilizer programs differentially affect leaf nutrition and nutrient factor productivity in mature HLB-affected 'Valencia' sweet orange trees in Florida.
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Huanglongbing (HLB) compromises citrus root function, nutrient uptake, and productivity, making fertilizer management critical for sustaining tree performance in affected groves. This study evaluated conventional and controlled-release fertilizer (CRF) programs in mature HLB-affected 'Valencia' sweet orange trees grown on sandy soil in Florida. Treatments consisted of a conventional standard fertilizer program (Standard) and two CRF programs, CRF1 and CRF2. Leaf nutrient concentrations, fruit yield, juice quality, partial factor productivity (PFP), and multivariate response profiles were assessed. CRF1 increased selected leaf macronutrient concentrations, particularly magnesium (Mg) and sulfur (S), whereas micronutrient responses were limited mainly to manganese (Mn). Fruit yield did not differ among treatments in 2024 or 2025; however, CRF2 reduced yield in 2026 compared with Standard and CRF1. Juice quality attributes were not significantly affected by fertilization program. In contrast, PFP was more responsive to nutrient management, with CRF2 showing the highest PFP for potassium (PFP-K
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