Managing Global Resources for a Secure Future

2017 Annual Meeting | Oct. 22-25 | Tampa, FL

73-6 Soil-Based, Field-Specific Nitrogen Fertilizer Recommendations in Corn.

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: Poster and 5 Minute Rapid--Soil Fertility and Plant Nutrition

Monday, October 23, 2017: 11:45 AM
Marriott Tampa Waterside, Room 10

Chester Eugene Greub1, Trenton L. Roberts1, Nathan A. Slaton1, Richard J. Norman1, Jason Kelley2 and Kelsey L. Hoegenauer1, (1)Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR
(2)University of Arkansas, Little Rock, AR
Abstract:
Current research findings will highlight research focused on correlating and calibrating a soil-based N test for the determination of field-specific N fertilizer recommendations in Mid-South irrigated corn (Zea mays L.) production. Nitrogen response trials were established throughout the primary corn producing regions of Arkansas from 2013 to 2016. Nitrogen fertilizer rates ranged from 0 to 360 kg N ha-1 and were split applied between an at-planting and two in-season applications. Soil samples were collected in 15 cm increments down to a depth of 60 cm prior at the V4-V6 growth stage and were analyzed for alkaline-hydrolyzable N, NH4-N, and NO3-N. Our results have demonstrated the ability of using both organic and inorganic-N to accurately determine site-specific N recommendations for furrow-irrigated Mid-South corn production. Current pre-sidedress NO3-N recommendations for corn production in the Mid-West do not appear to apply for Mid-South production systems. There were several sites within these trials that continued to have a positive response to the addition of N fertilizer even when there was greater than 21 mg NO3-N kg soil-1 to a depth of 30 cm. Calibration of several different soil test methods including soil NO3-N showed strong relationships for predicting N fertilizer needs to achieve 95% relative grain yield. Similar to other researchers, soil-based N tests for corn production are tightly linked to soil texture and drainage classification.

See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: Poster and 5 Minute Rapid--Soil Fertility and Plant Nutrition