Soybean Response to Rhizobia on Previously Flooded Sites in Southern Wisconsin
2011
Furseth, Branden J. | Conley, Shawn P. | Ané, Jean-Michel
Due to increased moisture and flooding in the midwestern United States during the 2008 growing season, some soybean [Glycine max (L.) Merr.] growers were concerned about the viability of soil rhizobia (Bradyrhizobium sp.) in 2009. Three field experiments were established on land, which had previously been flooded for an extended period of time, to test the performance of rhizobia inoculants and the seed yield and quality response to the initial soil rhizobia population. Seed yield and oil content did not respond to rhizobia inoculants across locations (P = 0.39 and 0.70, respectively), whereas seed protein content response differed among inoculants (P = 0.006). Yield (P = 0.01, R ² = 0.10) and protein (<0.001, R ² = 0.36) content were negatively correlated with the initial rhizobia population. Seed oil content was positively correlated with the initial rhizobia population (P = 0.009, R ² = 0.10). Results suggest that initial soil rhizobia populations were adequate for optimum crop growth and the addition of a rhizobia inoculant was not required in these environments.
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