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Nitrate-Nitrogen Concentrations in the Perched Ground Water under Seepage-Irrigated Potato Cropping Systems

^a Horticultural Sciences Dep., Univ. of Florida, Fifield Hall, PO Box 110690, Gainesville, FL 32611
^b Soil and Water Science Dep., McCarty Hall, PO Box 110290, Gainesville, FL 32611
^c Statistics & Evaluation Center, American Cancer Society-NHO, 1599 Clifton Road, NE, Atlanta, GA 30329

View larger version (81K): [in this window] [in a new window]   Fig. 1. Map of Florida showing St. Johns River, the Tri-County Agricultural Area (TCAA), and Hastings.

View larger version (30K): [in this window] [in a new window]   Fig. 2. Crop cycles, sampling schedules, and precipitation pattern over the 3-yr (2001–2003) period of study.

View larger version (30K): [in this window] [in a new window]   Fig. 3. Predicted and observed NO3–N concentrations in the perched ground water under four crop rotations and three N rates during 2001. PCF, potato-cowpea-fallow; PCG, potato-cowpea-green bean; PSF, potato-sorghum-fallow; PSG, potato-sorghum-green bean. Model significance: *p < 0.05; **p < 0.01; ***p < 0.0001; ns = not significant.

View larger version (27K): [in this window] [in a new window]   Fig. 4. Predicted and observed NO3–N concentrations in the perched ground water under four crop rotations and three N rates during 2002. PCF, potato-cowpea-fallow; PCG, potato-cowpea-green bean; PSF, potato-sorghum-fallow; PSG, potato-sorghum-green bean. Model significance: *p < 0.05; **p < 0.01; ***p < 0.0001; ns = not significant.

View larger version (27K): [in this window] [in a new window]   Fig. 5. Predicted and observed NO3–N concentration in the perched ground water under four crop rotations and three N rates during 2003. PCF, potato-cowpea-fallow; PCG, potato-cowpea-green bean; PSF, potato-sorghum-fallow; PSG, potato-sorghum-green bean. Model significance: *p < 0.05; **p < 0.01; ***p < 0.0001; ns = not significant.

View larger version (29K): [in this window] [in a new window]   Fig. 6. Predicted and observed NO3–N concentrations in the soil solution under four crop rotations and three N rates during 2002. PCF, potato-cowpea-fallow; PCG, potato-cowpea-green bean; PSF, potato-sorghum-fallow; PSG, potato-sorghum-green bean. Model significance: *p < 0.05; **p < 0.01; ***p < 0.0001; ns = not significant.

View larger version (23K): [in this window] [in a new window]   Fig. 7. Nitrate-nitrogen concentrations in the perched ground water under sorghum and cowpea at three N rates during 2003. Confidence intervals are at the 0.95 level of significance.