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Corn Yield Response to Nitrogen at Multiple In-Field Locations

^a Dep. of Agron., Kansas State Univ., Manhattan, KS 66506
^b Cascade Earth Sci., Spokane, WA 99214
^c Dep. of Agron. and Hortic., South Central Res. and Ext. Cent., Univ. of Nebraska, Clay Center, NE 68933
^d Dep. of Biol. and Agric. Eng., Kansas State Univ., Manhattan, KS 66506
^e NC+, Moscow, KS 67120
^f Soil Sci. Dep., North Carolina State Univ., Raleigh, NC 27695

View larger version (16K): [in a new window]   Fig. 1. Example of the field layout for the (a) Harvey and Reno sites and (b) Buffalo site. Numbers identify in-field locations, with 1 through 5 corresponding to increasing soil organic matter content (see Table 1). Inset depicts the individual plot layout at each location. Field size is about 55 ha each.

View larger version (20K): [in a new window]   Fig. 2. Grain yield as a function of increasing N fertilizer for multiple in-field locations at the Harvey site in (a) 1998 and (b) 1999. Soil organic matter content (g kg-1) is provided in parentheses.

View larger version (11K): [in a new window]   Fig. 3. Grain yield as a function of increasing N fertilizer across all in-field locations at the Reno site in 1999.

View larger version (17K): [in a new window]   Fig. 4. Grain yield as a function of increasing N fertilizer for multiple in-field zones of soil organic matter (OM) at the Buffalo site in (a) 1998 and (b) 1999. Soil OM content (g kg-1) is provided in parentheses.

View larger version (21K): [in a new window]   Fig. 5. Relative grain yield as a function of leaf tissue N concentration (R1 growth stage) at the Harvey site in (a) 1998 and (b) 1999. A confidence interval (CI) of 95% is provided for x0.

View larger version (21K): [in a new window]   Fig. 6. Relative grain yield as a function of leaf tissue N concentration (R1 growth stage) at the Reno site in 1999. A confidence interval (CI) of 95% is provided for x0.