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Inquiries occasionally occur about symptoms associated with Iron (Fe) deficiency in soybeans. This article discusses causes, symptoms, and a few management practices if the problem is severe.
The availability of a specific micronutrient, such as iron (Fe), is often related to soil characteristics. Soil pH has a major impact on the availability of Fe. Iron deficiency has been a common, serious, and yield limiting problem for soybean production in some parts of the United States. Iron is one of the necessary micronutrients for soybean plant growth and development.
Severe yield reductions have been reported from IDC throughout the North-Central U.S. Loss is estimated to be around $120 million annually1.
Soybean IDC symptoms typically occurs between the first and third trifoliate stage. Depending on the severity of the problem, symptoms might improve later in the season. Severe stress can stunt soybean plants causing 50% or more yield reduction and may even kill the plants.
Weather also plays a role in IDC symptoms. Cool soil temperatures and wet weather, combined with soils that have marginal levels of available Fe can increase IDC symptoms.
Sources:1The Mysteries Of Yellow Soybeans. 2007. Corn & Soybean. http:// cornandsoybeandigest.com (Viewed 4/12/10)2Karkosh, A. et al. 1988. Seed treatment for control of IDC of soybean. Crop Sci. 28:369-370, (Viewed 5/18/10) Corn & Soybean Field Guide. 2007 Edition. Purdue Pest Management Program. Purdue Univ., (Viewed 4/4/10) Diaz, D. 2008. Nutrient deficiency symptoms. Agronomy e-Updates, K-State Extension Common nutrient deficiency symptoms, soybeans. 2007. http://plantsci.sdstate.edu, (Viewed 4/4/10) Sawyer, J. 2007. Integrated Pest Management Nutrient Deficiencies and Application Injuries in Field Crops. Department of Agronomy, http://extension.agron.iastate.edu, (Viewed 4/4/10) Advance agronomic guide 2009-2010, growing knowledge, Monsanto CO. Pedersen, P. 2007. Soybean Nutrient Requirements. Iowa State University Ext. http:// extension.agron.iastate.edu., (Viewed 4/4/10) Soybean production handbook. 1997. Kansas State Univ., C-449. Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Technology Development by Monsanto and Design(SM) is a servicemark of Monsanto Technology LLC. ©2010 Monsanto Company.