Evaluation of fertilizers for reduction of iron deficiency chlorosis in soybeans
Sustainable Production
Crop protectionDiseaseField management
Lead Principal Investigator:
R Jay Goos, North Dakota State University
Co-Principal Investigators:
Brian Johnson, North Dakota State University
Sarah Lovas, North Dakota State University
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Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

The fertilizer FeEDDHA is the only fertilizer available that reduces iron deficiency chlorosis (IDC) in soybeans. Unfortunately, FeEDDHA is not a standardized product, and the amount of Fe in the product that actually remains available upon application to soil varies from product to product. Also, some distributors are making erroneous claims as to the amount of product needed, relative to more established FeEDDHA. The results of this study should allow for the evaluation of commercial sources of FeEDDHA, and help farmers know the actual rates needed. The goal is to help farmers be fully informed when purchasing this material for fighting IDC.

Unique Keywords:
#feeddha, #iron deficiency chlorosis (idc), #leaf yellowing, #soybean diseases
Information And Results
Project Deliverables

In total, we performed about 2,000 different soil-stability evaluations. We calibrated the test against samples of known ortho-ortho-FeEDDHA content, and against response of soybeans in the greenhouse to iron fertilizers of varying quality.

Final Project Results

Iron fertilizers sold for soil application can range from very effective to completely ineffective. One iron fertilizer, FeEDDHA, is generally considered to be the most effective. Unfortunately, the quality of FeEDDHA fertilizer varies. Most commercial materials 6% Fe, with 40-80% of that held by the “good” isomer, ortho- ortho-FeEDDHA. Crop response to a poor-quality FeEDDHA product
is poor. Three FeEDDHA fertilizers of differing quality were applied to the soil at 0, 10, and 20 milligrams per pot. The higher the ortho-ortho-FeEDDHA content of the fertilizer, the better the crop response.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.