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Iron Deficiency Chlorosis in Soybean

Soybean Seeding Rate and Companion Crop Effects

Department of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Cir., St. Paul, MN 55108

View larger version (29K): [in a new window]   Fig. 1. Rainfall and average ambient temperature profiles for seven IDC environments from 15 May to 30 September. Rainfall distribution is shown as totals for early, mid-, and late-season precipitation by site. These seasonal totals represent 15 May through 30 June, 1 July through 14 August, and 15 August through 30 September.

View larger version (23K): [in a new window]   Fig. 2. Visual iron deficiency chlorosis (IDC) scores of soybean planted at 432 000 seeds ha–1 and with the addition of glyphosate-susc. soybean or oat. Glyphosate-susc. soybean was added at the rates of 124 000 or 247 000 seeds ha–1 (+124 K susc. and +247 K susc., respectively). Oat was added at rates of 19 and 37 kg ha–1 (+19 kg oat and +37 kg oat, respectively). Figures represent studies at two chlorotic environments in 2002 (Environments 1 and 10). Iron deficiency chlorosis scores were recorded on five dates. n = 6 ± SE.