Enhanced Efficiency Foliar Nitrogen and Pyraclostrobin Applications for High Yielding Corn

Kelly Nelson, Christopher Dudenhoeffer, Bruce Burdick and Dana Harder

Journal of Agricultural Science, 2015, vol. 7, issue 10, 17

Abstract: 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.

Date: 2015
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