Thursday, 9 October 2008: 10:15 AM

George R. Brown Convention Center, 371F

Edwin Lentz, Ohio State University - OARDC, 820 Country Creek Dr., Findlay, OH 45840-0702 and Robert Mullen, Ohio State University - OARDC, 1680 Madison Ave., Wooster, OH 44691

Anhydrous ammonia with a nitrification inhibitor is the only acceptable fall N program for corn in the Eastern Corn Belt. ESN may be an alternative program. To test this hypothesis, ESN, urea, and anhydrous ammonia plus a nitrification inhibitor were fall applied in 2005 and 2006 on a clay soil at the OARDC Northwest Research Station near Custar, OH. ESN and urea were incorporated soon after surface application. Fertilizers were applied at three N rates. Same treatments were repeated in the spring prior to planting. Experimental design was a three factor randomized block with four replications. Yields were similar between fall and spring applications for both years. In 2006, yields were similar among N sources regardless of application time. In 2007, fall applied urea yielded less than fall applied ESN or anhydrous ammonia and spring applied ESN yielded less than spring applied anhydrous ammonia or urea. Yields from fall applied ESN were similar to anhydrous ammonia plus a nitrification inhibitor for both years and may be an alternative fall program. However, ESN yields were less than anhydrous ammonia for spring applications in 2007, which may have been affected by abnormally dry conditions during the first half of the growing season.

See more of: Nitrogen Release from Soil and Soil Amendments
See more of: S04 Soil Fertility & Plant Nutrition

2008 Joint Annual Meeting (5-9 Oct. 2008): ESN as a Fall Nitrogen Source for Corn.

785-7 ESN as a Fall Nitrogen Source for Corn.