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Interpretive Summaries:
2008 - Effect of Nutrient Management and Fungicides on Soybeans in Southern Illinois
2007 - Effect of Nutrient Management and Fungicides on Soybeans in Southern Illinois
2006 - Nutrient Management Effects on Soybean Rust
2005 - Nutrient Management Effects on Soybean Rust
Effect of Nutrient Management and Fungicides on Soybeans in Southern Illinois, 2008
A field study was conducted at two locations – the University of Illinois Dixon Springs Ag. Center (DSAC) and Brownstown Agronomy Research Center (BARC) – from 2005 to 2008. The purpose was to determine the effects of K, Cl-, B, and Mn nutrition on the response of soybeans to diseases (possibly including Asian soybean rust) with and without the application of fungicides, across Roundup Ready® and conventional herbicide varieties. Pre-plant fertilizers included a comparison of potassium chloride (KCl) and potassium sulfate (K2SO4) at a rate of 75 lb K2O/A plus a check with no K. Foliar treatments included an application of either 0.5 lb chelated Mn/A or Solubor® at 0.25 lb B/A, or both, in addition to the KCl pre-plant treatment.
Foliar application of B and/or Mn caused some phytotoxicity problems in dry years and with multiple applications. The fungicide treatment reduced the incidence of frogeye leaf spot for many of the site-years, and increased yields about 50% of the time. None of the fertilizer treatments studied significantly affected soybean grain yields in any year, until 2008 at DSAC, where the combination of Cl-, B, and Mn increased yields slightly. The foliar application of B usually increased soybean leaf B and the application of Mn usually increased leaf Mn, but neither affected yields. The application of Cl-, Mn, and B significantly reduced disease levels in only one case (Dixon Springs, 2007), but there was no effect on soybean yields. IL-32
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