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Response of Coastal Bermudagrass Yield and Nutrient Uptake Efficiency to Nitrogen Sources

^a Univ. of Florida, Range Cattle Research and Education Center, 3401 Experiment Station, Ona, FL 33865
^b Texas Agricultural Experiment Station, Texas A&M Univ. System, P.O. Box 200, Overton, TX 75684-0200

View larger version (19K): [in this window] [in a new window]   Fig. 1. Monthly rainfall distribution. Line represents the 38-yr average rainfall.

View larger version (23K): [in this window] [in a new window]   Fig. 2. Coastal bermudagrass dry matter (DM) yield response to N rates for Gallime and Lilbert soils.

View larger version (34K): [in this window] [in a new window]   Fig. 3. Plant N concentrations in Coastal bermudagrass fertilized with various N sources for Gallime and Lilbert soils combined. Horizontal line indicates plant N concentration for the unfertilized control plots. UAN = urea–ammonium nitrate solution, ATS = ammonium thiosulfate, AS = ammonium sulfate, and AN = ammonium nitrate. Bars indicate standard deviation.

View larger version (23K): [in this window] [in a new window]   Fig. 4. Relative N uptake efficiency for Coastal bermudagrass fertilized with various N sources for Gallime and Lilbert soils combined. UAN = urea–ammonium nitrate solution, ATS = ammonium thiosulfate, AS = ammonium sulfate, and AN = ammonium nitrate. Same letters are not significantly different at P 0.05.

View larger version (21K): [in this window] [in a new window]   Fig. 5. Nitrogen uptake efficiency as a function of N application rate. Same letters within years are not significantly different at P 0.05.

View larger version (20K): [in this window] [in a new window]   Fig. 6. Changes in soil pH in response to N fertilizer application rates of 1, 45, 90, 135 kg N ha–1 harvest–1. Three harvests were made in Year 1, four in Year 2, and five in Year 3.