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Genotype x Environment Interactions within Iron Deficiency Chlorosis-Tolerant Soybean Genotypes

^a Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108
^b Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108

View larger version (21K): [in a new window]   Fig. 1. Mean iron deficiency chlorosis (IDC) scores over time for five western Minnesota environments studied in 2002. Values represent visual chlorosis scores (Cianzio et al., 1979) where 1 = green and 5 = severe chlorosis with some necrosis for each environment, and are means of 10 genotypes and four replications ± SE (n = 40). Scores were recorded on 21 June, 3 July, 12 July, 24 July, and 3 August.

View larger version (29K): [in a new window]   Fig. 2. Rainfall and daily mean temperatures for Environments 1, 2, and 3. Rainfall is represented as a summation of daily rainfall over 14-d periods beginning 15 May and ending 14 October. Daily mean temperatures are represented by third order regression curves drawn to best fit temperature data over the same period.