Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/2004
Publication Date: 11/1/2004
Citation: Bruns, H.A., Abbas, H.K. 2004. Influence of Nitrogen Fertility on Early Maturing Corn Hybrids in the Mississippi Delta. Proceeding of the ASA-CSSA-SSSA Annual Meeting, October 31 - November 4, 2004, Seattle, Washington. CDROM.
Technical Abstract: Four corn hybrids adapted for production above 40 degrees N latitude and two produced in the mid south US were grown at Stoneville, MS (33 degrees 26 minutes N, 90 degrees 55 minutes W) in 2002 and 2003 using N-fertility treatments of 112 kg N ha-1 pre-plant, 224 kg N ha-1 pre-plant, and 112 kg N ha-1 side dressed and growth stage V6. Required GDU10's to anthesis and growth stage R6, yields, grain quality, and mycotoxin contamination were evaluated. High N-fertility improved grain yields with no difference between the 224 kg N ha-1 and the split application. All of the northern adapted hybrids required significantly fewer GDU10's than the two southern hybrids to acquire anthesis. However a couple of the northern hybrids required as much or more GDU10's to reach growth stage R6. Yields of three of the northern hybrids were similar or better than those of the southern hybrids. Grain moisture and bulk density at harvest was lowest for the northern hybrids. Kernel weights differed among all hybrids with no consistency evident. Aflatoxin were greater in 2002 than 2003 with the northern hybrids having more contamination than the southern hybrids. Data on fumonisins were inconclusive. N-fertility did not affect mycotoxin levels.