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Fate of Nitrate and Bromide in an Unsaturated Zone of a Sandy Soil under Citrus Production

^a Center for Marine, Environmental Sciences, and Biotechnology Research, P.O. Box 20600, Savannah State University, Savannah, GA 30404
^b USDA-ARS, Vegetable and Forage Crops Research Unit, 24106 N. Bunn Road, Prosser, WA 99350
^c University of Florida, Institute of Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850
^d CMESBR, Savannah State University Savannah, GA 30404

View larger version (26K): [in a new window]   Fig. 1. Water balance components including rainfall, irrigation, simulated drainage below the rootzone, and evapotranspiration for a Tavares fine sand, with 25-yr-old ‘Hamlin’ orange trees on ‘Cleopatra’ mandarin rootstock. Arrows along the x axis show the soil sampling times during the study period.

View larger version (25K): [in a new window]   Fig. 2. Weekly minimum and maximum air temperature and total potential evapotranspiration used as input parameters for the Leaching Estimation and Chemistry Model (LEACHM) model.

View larger version (25K): [in a new window]   Fig. 3. Distribution of measured and Leaching Estimation and Chemistry Model (LEACHM)-simulated volumetric water content in the soil profile of a Tavares fine sand at various sampling times following an irrigation and rainfall events. Measured values are the mean and standard error of 45 samples per depth profile (five treatments x three repititions x three cores).

View larger version (23K): [in a new window]   Fig. 4. Distribution of measured and Leaching Estimation and Chemistry Model (LEACHM)-simulated Br- concentrations in the soil profile of a Tavares fine sand at various sampling times following the application of 80 kg Br- ha-1 as KBr under the citrus tree canopy. Measured values are the mean and standard error of 45 samples per depth profile (five treatments x three repititions x three cores).

View larger version (25K): [in a new window]   Fig. 5. Distribution of measured and Leaching Estimation and Chemistry Model (LEACHM)-simulated NO3–N in the soil profile of a Tavares fine sand at various sampling times following the broadcast application of water-soluble dry granular fertilizer containing NH4NO3. Measured values are the mean and standard error of nine samples per depth profile per treatment (three repititions x three cores).