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International Journal of Agronomy
Volume 2010, Article ID 543261, 8 pages
Research Article

Wheat (Triticum aestivum L.) Cultivar Selection Affects Double-Crop and Relay-Intercrop Soybean (Glycine max L.) Response on Claypan Soils

1Division of Plant Sciences, University of Missouri, Novelty, MO 63460, USA
2Greenley Research Center, University of Missouri, Novelty, MO 63460, USA

Received 29 March 2010; Accepted 26 May 2010

Academic Editor: Kent Burkey

Copyright © 2010 Kelly A. Nelson et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Field research (2003–2005) evaluated the effect of wheat row spacing (19 and 38 cm) and cultivar on double-cropped (DC) soybean response, 38-cm wheat on relay-intercrop (RI) response, and wheat cultivar selection on gross margins of these cropping systems. Narrow-row wheat increased grain yield 460 kg h a 1 , light interception (LI) 7%, and leaf area index (LAI) 0.5 compared to wide rows, but did not affect DC soybean yield. High yielding wheat (P25R37) with greater LI and LAI produced lower (330 kg  h a 1 ) soybean yields in an RI system than a low yielding cultivar (Ernie). Gross margins were $ 267  h a 1 greater when P25R37 was RI with H431 Intellicoat (ITC) soybean compared to Ernie. Gross margins were similar for monocrop H431 non-coated (NC) or ITC soybean, P25R37 in 19- or 38-cm rows with DC H431 NC soybean, and P25R37 in 38-cm rows with RI H431 ITC soybean in the absence of an early fall frost.