Response of 'Hamlin' orange to fertilizer source, annual rate and irrigated area

Arnold W. Schumann, Ali Fares, Ashok K. Alva, Siva Paramasivam


Improving fertilizer and water use efficiencies are important management goals in Florida citrus production. Increasing costs of energy, fertilizer and water will reduce the profitability of citrus production if yields are not optimized. Improved water and fertilizer use efficiencies can also minimize the impact of nitrate leaching to groundwater. Two 'Hamlin' experiments 1) comparing dry granular, fertigation, and controlled release fertilization at four rates, and 2) comparing three microsprinkler wetting diameters and two fertilizer rates were assessed in years 7-8. Yield and leaf nitrogen concentrations showed a strong quadratic response, suggesting an optimum fertilization rate beyond which lower fertilizer uptake efficiencies and profitability exist. Increasing microsprinkler wetting diameters increased yields without additional water or fertilizer consumption.


controlled release fertilizer; fertigation; granular fertilizer

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283