2020
Control Measures for Iron Deficiency Chlorosis in Soybeans
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Contributor/Checkoff:
North Dakota Soybean Council
Category:
Sustainable Production
Keywords:
GeneticsGenomicsSeed quality
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
R Jay Goos, North Dakota State University
Co-Principal Investigators:
Project Code:
QSSB
Contributing Organization (Checkoff):
North Dakota Soybean Council
$5,637
Leveraged Funding (Non-Checkoff):
North Dakota State Board of Agricultural Research and Extension (SBARE), $10,103
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Institution Funded:
North Dakota State University
$5,637
Brief Project Summary:

Iron deficiency chlorosis (IDC) continues to be a destructive disorder in soybeans. Several control measures are known including a resistant variety, in-furrow application of fertilizer, and wider row spacings or heavier seeding rates. This project will investigate newly-discovered seed treatments and foliar spray treatments based on recent discoveries of new pathways to reduce IDC. It is hoped that new, lower cost control measures can be identified. This project also supports the seed industry with variety selection and the fertilizer industry in the evaluation of iron fertilizers to be sold.

Key Benefactors:
farmers, agronomists, applicators, extension specialists

Information And Results
Final Project Results

Update:

View uploaded report Word file

Traditional control measures for IDC are "stack-able." For example, the effects of planting a resistant variety, an in-furrow application of FeEDDHA, and planting in wider rows, all "stack" and add to the reduction of IDC. A variety's resistance to IDC is determined by genes involved with iron uptake, and other genes involved with iron translocation or other processes. So, one could say that these genetic traits also "stack" to define the IDC resistance of a variety.

This research used this concept to identify potential control measures for IDC, on a physiological level. What happens when you "stack" a known control measure for IDC, FeEDDHA fertilizer, with other compounds that might reduce IDC? For example, IDC is, by definition, a lack of chlorophyll in the plant. What happens if you combine FeEDDHA with a compound that stimulates chlorophyll production by the plant?

This research screened seed treatments and foliar sprays to be used with FeEDDHA, to reduce IDC. Two examples are given here. In a greenhouse experiment, soil was treated with three rates of Fe as FeEDDHA (Soygreen), and the seed was treated with four rates of an experimental compound. The chlorophyll levels of the 1st and 2nd trifoliolate leaflets were measured. As anticipated, the two treatments "stacked" with each other, as both soil treatment with FeEDDHA and the seed treatment greatly increased the chlorophyll level of this susceptible variety, giving normal chlorophyll levels (>30) when both were used.

In a field study, chlorotic soybeans were sprayed with FeEDDHA, with and without an experimental compound. In each replicate, from left to right: No spray, sprayed with FeEDDHA, and sprayed with FeEDDHA plus an experimental compound. Again, the two compounds appeared to work together to reduce IDC. Further research is needed.

The experimental compounds are not identified in this report, as it is being determined if any of the treatments identified in this research could be patented by NDSU.

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.