Abstract

Field experiments were conducted at the Kansas River Valley Experiment Field, located near Rossville and Topeka, KS, in the summer of 2014 to evaluate effects of late-season nitrogen (N) fertilizer application on modern soybean genotypes. A unique fertilizer N source (urea) was applied at five N rates (0, 40, 80, 120, and 160 lb N/a) to soybean at the R3 growth stage. The main objective was to determine if late-season N application has an agronomical benefit to soybean producers. Overall soybean yields ranged from 43.7 to 57.5 bu/a considering both experimental fields. At Rossville, sudden death syndrome (SDS) affected the final soybean yield potential. Application of late-season N fertilizer did not significantly increase soybean yields at the evaluated sites. Maximum soybean yields, 46 bu/a at Rossville and 57 bu/a at Topeka, were documented at the 0-N fertilizer rate.

Keywords: soybean, late-season nitrogen fertilizer, yield

How to Cite:

Hodgins, D. R., Adee, E. A. & Ciampitti, I. A., (2015) “Late-Season Nitrogen Fertilizer Application in Soybean”, Kansas Agricultural Experiment Station Research Reports 1(2). doi: https://doi.org/10.4148/2378-5977.1014