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Iron Acquisition of Three Soybean Varieties Grown at Five Seeding Densities and Five Rates of Fe–EDDHA

University of Minnesota, Northwest Research and Outreach Center, Crookston, MN 56716

View larger version (23K): [in this window] [in a new window]   Fig. 1. Decline in visual chlorosis score at V2–V3 stages of development in response to (A) the main effects of seeding density (SD) and (B) Fe–EDDHA rate (IR) in trials with nil (2001), mild (2002), and moderate (2000) Fe deficiency.

View larger version (21K): [in this window] [in a new window]   Fig. 2. Similar increases in seed number in response to (A) the main effect of seeding density (SD) in three environments often masked the important variety (V) x SD interactions observed in (B) 2000, (C) 2001, and (D) 2002.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Significant increases in seed number were noted each of three environments in response to (A) the main effect of Fe–EDDHA rate (IR); the two-way V x IR interactions observed in (B) 2000, (C) 2001, and (D) 2002 were not significant.

View larger version (22K): [in this window] [in a new window]   Fig. 4. Increases in grain yield in response to (A) the main effect of seeding density (SD) varied among environments, as did the variety (V) x SD interactions observed in (B) 2000, (C) 2001, and (D) 2002.

View larger version (20K): [in this window] [in a new window]   Fig. 5. Increases in grain yield in response to (A) the main effect of Fe–EDDHA rate (IR) in three environments and the similarity of variety (V) responses observed in (B) 2000, (C) 2001, and (D) 2002.

View larger version (21K): [in this window] [in a new window]   Fig. 6. Seed [Fe] increased similarly in response to (A) the main effect of seeding density (SD) in each environment, whereas the variety (V) x SD interactions observed in (B) 2000, (C) 2001, and (D) 2002, identify largely different responses between resistant and susceptible varieties.

View larger version (20K): [in this window] [in a new window]   Fig. 7. Increase in seed [Fe] in response to (A) the main effect of Fe–EDDHA rate (IR) in three environments and the nonsignificant variety V x IR interactions observed in (B) 2000, (C) 2001, and (D) 2002.