97339
Interaction of Nitrogen Rates and Cultivars for Corn Grown in Single-Row and Twin-Row Planting Systems.

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See more from this Session: Professional Oral - Crops 1
Tuesday, February 9, 2016: 9:00 AM
Hyatt Regency Riverwalk San Antonio , Rio Grande Ballroom East
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M. Wayne Ebelhar, 82 Stoneville Road, Mississippi State University, Stoneville, MS
Twin-row production has been accepted as a means of increasing both corn and soybean yields in wide-row bedded production systems in the Mid-south.  Research on corn in the Mississippi Delta has shown a significant economic impact of increasing seeding rates for twin-row systems compared to single-row systems that produces a greater return than increasing nitrogen (N) rates even though the yield response was significant.   A multi-year field study was initiated in 2013 to evaluate the interaction of cultivars and N rate in both single-row [SR] and twin-row [TR] production systems.  Four corn cultivars ranging in relative maturity from 113 to 120 days were evaluated at 140, 180, 220, and 260 lb N/acre (157 to 291 kg N/ha) with 100 lb N/acre (112 kg N/ha) applied at planting and the remaining N applied as a sidedress application at V5-V6.  Based on previous research the seeding rates were set at 32,500 seed/acre (80,275 seed/ha) for the SR system and 37,500 seed/acre (92,625 seed/ha) in the TR system.  All cultural practices were maintained uniformly across all treatments and the center two rows of each plot were harvested with a commercial combine modified for plot harvest.  Each year, the TR system has produced significantly higher yields than the SR system when averaged across N rates and cultivars.  There has not been a significant advantage to increasing N rates above 220 lb N/acre (246 kg N/ha).  The corn study has been following soybean in rotation and in most cases, for irrigated corn, 210-220 lb N/acre has been sufficient.  Cultivar differences have been evident from year to year but not consistent from year to year.  Grain yields from this study have ranged from 220 to 257 bu/acre (13.8 to 16.1 Mg/ha) for the various row pattern by cultivar combinations averaged across N rates.
See more from this Division: Submissions
See more from this Session: Professional Oral - Crops 1