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High Rates of Fe-EDDHA and Seed Iron Concentration Suggest Partial Solutions to Iron Deficiency in Soybean

Univ. of Minnesota, Northwest Res. and Outreach Cent., Crookston, MN 56716

View larger version (24K): [in a new window]   Fig. 1. Increase in relative chlorophyll concentrations at seedling and early-season stages of plant development in three environments in response to increasing rates of Fe-EDDHA.

View larger version (22K): [in a new window]   Fig. 2. Increase in relative chlorophyll concentrations at mid- and late-season stages of plant development in three environments in response to increasing rates of Fe-EDDHA.

View larger version (22K): [in a new window]   Fig. 3. Decline in visual chlorosis score in response to increasing rates of Fe-EDDHA recorded at V3 for resistant and susceptible soybean cultivars in three environments. Cultivar means at higher chelate rates occasionally overlap and are indistinguishable from each other.

View larger version (21K): [in a new window]   Fig. 4. Increase in plant height in response to increasing rates of Fe-EDDHA for iron deficiency chlorosis resistant and susceptible soybean cultivars grown in three environments.

View larger version (22K): [in a new window]   Fig. 5. Increase in seed number in response to increasing rates of Fe-EDDHA for iron deficiency chlorosis resistant and susceptible soybean cultivars grown in three environments.

View larger version (21K): [in a new window]   Fig. 6. Increase in grain yield in response to increasing rates of Fe-EDDHA for iron deficiency chlorosis resistant and susceptible soybean cultivars grown in three environments.

View larger version (20K): [in a new window]   Fig. 7. Increase in seed Fe concentration (seed [Fe]) in response to increasing rates of Fe-EDDHA for iron deficiency chlorosis resistant and susceptible soybean cultivars grown in three environments.

View larger version (14K): [in a new window]   Fig. 8. Relative grain yield versus seed Fe concentration (seed [Fe]) at harvest. For resistant (susceptible) cultivars, grain yield was relative to the highest mean grain yield of resistant (susceptible) cultivars within each environment.