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Combining a foliar fertilizer and fungicide in a single application could complement soil-applied nitrogen (N) and reduce application costs. Limited research has evaluated such combinations for high-yield corn ( Zea mays L.) production systems. This research evaluated the effect of mixing order of enhanced-efficiency foliar N (30-0-0-0, Nitamin) rates (0, 9, and 28 L ha -1 ) with pyraclostrobin under different crop-yield environments (soil applied N at 84, 169, and 337 kg ha -1 ) on crop injury, disease severity, chlorophyll content, grain quality, and yield at Novelty and Albany, Missouri, in 2010 and 2011. There was no effect of 30-0-0-0 at 9 or 28 L ha -1 on corn yields in low- (soil applied N at 84 kg ha -1 ) or medium-yield environments (soil applied N at 169 kg ha -1 ). In a high-yield environment (soil applied N at 337 kg ha -1 at Novelty and Albany), 30-0-0-0 at 9 L ha -1 increased grain yields 0.38 Mg ha -1 (3.7%) compared to the non-treated control, but 30-0-0-0 at 28 L ha -1 did not increase yield due to 3-4% crop injury. In a high-yield environment (> 9.4 Mg ha -1 ), pyraclostrobin increased yields 3.9 to 7.1% (0.38 to 0.7 Mg ha -1 ) compared to the non-treated plants. This study found no significant effect of mixing order on corn yield response when 30-0-0-0 was applied with pyraclostrobin at 0.055 kg ai ha -1 . The severity of diseases ( Cercospora zea-maydis , Puccinia sorghi , and Exserohilum turcicum ), which was less than 12% depending on the treatment, was affected by soil-applied N rate, 30-0-0-0 rate, and pyraclostrobin, depending on the site-year. Pyraclostrobin at 0.11 kg ai ha -1 (7.1%) and 30-0-0-0 at 9 L ha -1 (3.7%) were the highest-yielding treatments compared to the non-treated control with good crop safety.

Enhanced Efficiency Foliar Nitrogen and Pyraclostrobin Applications for High Yielding Corn