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Nitrogen Removal and Nitrate Leaching for Two Perennial, Sod-Based Forage Systems Receiving Dairy Effluent

^a Jr., Animal Sciences Dep., Univ. of Florida, IFAS, Gainesville, FL 32611
^b Central Mississippi Research and Extension Center, MSU, Raymond, MS 39154

View larger version (23K): [in a new window]   Fig. 1. Monthly average maximum and minimum daily temperatures (1961–1990) and daily total solar radiation (TSR; 1955–1987) recorded at the Green Acres Agronomy Farm near Gainesville, Florida. Green Acres is 40 km east of the actual study site.

View larger version (56K): [in a new window]   Fig. 2. Weekly total rainfall distribution at the research site near Bell, Florida during four 12-mo cropping cycles: (a) 1996–1997, (b) 1997–1998, (c) 1998–1999, and (d) 1999–2000.

View larger version (20K): [in a new window]   Fig. 3. Sectional diagram of the dairy effluent sprayfield showing placement of mainplots, sprinklers, and changeover areas.

View larger version (46K): [in a new window]   Fig. 4. Nitrate N concentration in soil water extracted from 1.5 m below the surface for the corn–bermudagrass–rye system at three dairy effluent N loading rates during four 12-mo cropping cycles near Bell, Florida. Where significant differences occurred among means within a sampling date, an S designation was assigned. Under each of the S1 through S4 designations, the upper letter is for the highest mean within a sampling date, the middle letter is for the intermediate mean, and the bottom letter is for the lowest mean. Means within sampling date followed by the same letter are not different (P > 0.10). An arrow following an S designation indicates consecutive sampling dates with the same designation. Actual N loading rates from each cycle are shown in Table 1. The growth period shown for each forage is from seedling or shoot emergence through harvest.

View larger version (47K): [in a new window]   Fig. 5. Nitrate N concentration in soil water extracted from 1.5 m below the surface for the corn–perennial peanut–rye system at three dairy effluent N loading rates during four 12-mo cropping cycles near Bell, Florida. Where significant differences occurred among means within a sampling date, an S designation was assigned. Under each of the S1 through S4 designations, the upper letter is for the highest mean within a sampling date, the middle letter is for the intermediate mean, and the bottom letter is for the lowest mean. Means within sampling date followed by the same letter are not different (P > 0.10). An arrow following an S designation indicates consecutive sampling dates with the same designation. Actual N loading rates from each cycle are shown in Table 1. The growth period shown for each forage is from seedling or shoot emergence through harvest.