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Within-Field Variation in Corn Yield and Grain Quality Responses to Nitrogen Fertilization and Hybrid Selection

Dep. of Soil, Water, and Climate, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108. Contribution of the Precision Agriculture Center, University of Minnesota

View larger version (79K): [in a new window]   Fig. 1. Field plot showing order 1 soil survey (USDA-NRCS), N treatment strips, corn sampling locations, and the concept of "Station."

View larger version (30K): [in a new window]   Fig. 2. Corn yield and quality responses to N rate averaged across hybrids and environments. (A) Corn yield; (B) oil content; (C) protein content; (D) starch content; and (E) test weight. Vertical bars represent ±SE of the mean.

View larger version (45K): [in a new window]   Fig. 3. Corn yield response to N rate in different environments. (A) Field 1, 2001; (B) Field 2, 2001; (C) Field 3, 2002; (D) Field 4, 2002; (E) Field 1, 2003; and (F) Field 5, 2003. Vertical bars represent ±SE of the mean.

View larger version (43K): [in a new window]   Fig. 4. Corn oil content response to N rate in different environments. (A) Field 1, 2001; (B) Field 2, 2001; (C) Field 3, 2002; (D) Field 4, 2002; (E) Field 1, 2003; and (F) Field 5, 2003. Vertical bars represent ±SE of the mean.

View larger version (39K): [in a new window]   Fig. 5. Corn protein content response to N rate in different environments. (A) Field 1, 2001; (B) Field 2, 2001; (C) Field 3, 2002; (D) Field 4, 2002; (E) Field 1, 2003; and (F) Field 5, 2003. Vertical bars represent ±SE of the mean.

View larger version (42K): [in a new window]   Fig. 6. Corn starch content response to N rate in different environments. (A) Field 1, 2001; (B) Field 2, 2001; (C) Field 3, 2002; (D) Field 4, 2002; (E) Field 1, 2003; and (F) Field 5, 2003. Vertical bars represent ±SE of the mean.

View larger version (40K): [in a new window]   Fig. 7. Corn test weight response to N rate in different environments. (A) Field 1, 2001; (B) Field 2, 2001; (C) Field 3, 2002; (D) Field 4, 2002; (E) Field 1, 2003; and (F) Field 5, 2003. Vertical bars represent ±SE of the mean.