corn, soybean, oat, berseem clover, rotation, nitrogen
Nitrogen (N) fertilization recommendations are not available for corn in rotation with small grains or forages despite the possibility that the N response may differ from that of more conventional corn-soybean rotations. Rotations of corn with soybean (CS), corn with soybean and oat (CSO) and corn with soybean and an oat/berseem clover intercrop (CSOB) were established in 1991 and studied from 1993 through 1998 to determine the optimal N fertilization level for corn produced in each rotation. Corn in each rotation received NH4N03 applied at the rates of 0, 56, 112, or 168 kg N ha-1. Significant differences in corn grain yield occurred between rotations in three years, but no rotation was consistently superior. Corn grain yield increased with N fertilizer in each year, but in 3 of 6 years there was no advantage to applying Nat a rate greater than 112 kg ha-1. No difference in N response between rotations was observed.
Journal of the Iowa Academy of Science
© Copyright 2000 by the Iowa Academy of Science, Inc.
Harbur, M. M.; Ghaffarzadeh, M.; and Cruse, R. M.
"Corn (Zea mays L.) Yield Response to Nitrogen Fertilizer in Conventional and Alternative Rotations,"
The Journal of the Iowa Academy of Science: JIAS: Vol. 107:
, Article 5.
Available at: http://scholarworks.uni.edu/jias/vol107/iss2/5