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Phosphorus and Nitrate Nitrogen in Runoff Following Fertilizer Application to Turfgrass

Department of Crop and Soil Sciences, Univ. of Georgia, Griffin Campus, 1109 Experiment Street, Griffin, GA 30223-1797

View larger version (29K): [in a new window]   Fig. 1. Runoff volumes for three rates of fertilizer as averages of two years. Bars with the same letters within a time interval are not different according to an LSD at the 5% level.

View larger version (26K): [in a new window]   Fig. 2. Runoff volume versus soil moisture for 25- and 50-mm simulated rainfall events.

View larger version (32K): [in a new window]   Fig. 3. Phosphorus concentrations in runoff water for three fertilizer rates at 4 hours after treatment (HAT) and 24 HAT for each of two years. Bars with the same letters within a time interval are not different according to an LSD at the 5% level.

View larger version (25K): [in a new window]   Fig. 4. Phosphorus concentrations in runoff water for three fertilizer rates at 72 hours after treatment (HAT) and 168 HAT for each of two years. Bars with the same letters within a time interval are not different according to an LSD at the 5% level.

View larger version (26K): [in a new window]   Fig. 5. Nitrate N concentrations in runoff water for three fertilizer rates at 4 hours after treatment (HAT) and 24 HAT for each of two years. Bars with the same letters within a time interval are not different according to an LSD at the 5% level.

View larger version (29K): [in a new window]   Fig. 6. Nitrate N concentrations in runoff water for three fertilizer rates at 72 hours after treatment (HAT) and 168 HAT for each of two years. Bars with the same letters within a time interval are not different according to an LSD at the 5% level.

View larger version (29K): [in a new window]   Fig. 7. Mass of nitrate N in runoff water for three fertilizer rates at four times after treatment as averages of two years. Bars with the same letters within a time interval are not different according to an LSD at the 5% level.