1350
How raised beds and Fe-chelate affect soybean iron deficiency chlorosis and yield
Lucas C. Holmes; Hans J. Kandel; Grant H. Mehring; Peder K. Schmitz
Original research article
Field experiment
Soybean
Iron
View source document
year
2021
Country
United States
Abstract

Water-logging and the inability to take up sufficient iron (Fe), causing iron deficiency chlorosis (IDC) in soybean (Glycine max, L. Merr.), can be major yield reducing factors in certain soils in the northern USA and Manitoba, Canada, soybean growing regions. The objective of this research was to evaluate soybean IDC, biomass production, and yield with seeding on raised beds and seed application of the Fe-chelate compound ortho-ortho-Fe-EDDHA. In six environments, soybean were seeded on raised beds and conventionally prepared seedbeds (flat) and with a factorial arrangement of five cultivars (within adapted maturity group 0.1 to 0.9 and variable IDC tolerance) and seed applied Fe-EDDHA using rates of 0 kg.ha-1 and 3.36 kg.ha-1. There were no significant interactions between the factors tested. The plant population was 27% higher on the raised beds compared with flat, and yield was 6.3% higher (2893 kg.ha-1 vs. 2722 kg.ha-1). Total dry plant biomass on raised beds was 9.8% greater compared with flat. The plant population with seed applied Fe-EDDHA was 10.6% lower compared with no application. However, the IDC score was significantly lower 2.2 vs 2.4 (1 = green, 5 = dead) for Fe-EDDHA seed application. Yield and plant biomass were not significantly different between Fe treatments. Raised beds offer an opportunity for soybean growers to reduce the negative influence of excessive water. Further research is needed to determine the long-term effect of raised beds on plant development, IDC expression, and yield. The application of Fe-EDDHA remains a partial solution and should therefore be combined with other methods to reduce IDC. Further research should study other Fe-EDDHA application rates and methods.

Keywords

soybean; iron deficiency chlorosis; Fe-EDDHA; raised beds; yield; North Dakota; Manitoba; waterlogging

Outcomes reported
Biomass
Plant growth
Crop quality
Soil properties
Physiological
Soil properties
Yield
Synthesis
Key insight
Seed-applied Fe-EDDHA lowered soybean IDC scores but did not significantly change yield or biomass across six North Dakota environments, while raised beds improved stand establishment and yield.
Limitations
Only one Fe-EDDHA rate was tested and the raised-bed factor complicates direct attribution of agronomic gains to iron treatment alone.
Welland | Ontario | Canada‍
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