Nitrogen fixation is the process of converting atmospheric nitrogen into a usable form for the plant and is critical for producing higher yields in soybean. For nitrogen-fixation to occur, the nitrogen-fixing bacteria known asBradyrhizobia japonicum need to be readily available in the soil or must be applied to the seed to form nodules on the soybean root. Because of the widespread production of soybean across Iowa, most Iowa fields have sufficient infestations of these bacteria to fully nodulate soybean without the use of supplemental inoculants. However, questions frequently arise concerning the need for seed inoculation when planting soybean in fields without a recent history of soybean production, such as fields in the Conservation Reserve Program (CRP).
Iowa State University
Hartzler, Robert G., "Do CRP Acres Converted to Soybean Require Inoculation?" (2010). Integrated Crop Management News. 467.
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