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International Journal of Agronomy
Volume 2011, Article ID 109280, 9 pages
http://dx.doi.org/10.1155/2011/109280
Research Article

Glufosinate Effects on Nitrogen Nutrition, Growth, Yield, and Seed Composition in Glufosinate-Resistant and Glufosinate-Sensitive Soybean

1Crop Production Systems Research Unit, USDA-Agricultural Research Service, 141 Experiment Station Road, Stoneville, MS 38776, USA
2Crop Genetics Research Unit, USDA-Agricultural Research Service, 141 Experiment Station Road, Stoneville, MS 38776, USA
3Department of Plant Protection and Key Laboratory of Soybean Biology in Chinese Ministry of Education, Agronomy College, Northeast Agricultural University, Harbin, Heilongjiang 150030, China

Received 7 April 2011; Accepted 6 June 2011

Academic Editor: Patrick J. Tranel

Copyright © 2011 Krishna N. Reddy 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.

Abstract

Glufosinate applied to glufosinate-resistant crops may drift and injure glufosinate-sensitive crops. A 2-yr field study examined glufosinate effects on plant injury, chlorophyll content, nodulation, nitrogenase activity, leaf nitrogen, yield, and seed composition in soybean. Glufosinate drift was simulated by application at 45 g/ha to glyphosate-resistant and conventional (glufosinate-sensitive) soybean at 3 weeks after planting (WAP). Glufosinate effects were also evaluated in glufosinate-resistant soybean at 450 g/ha applied twice at 3 and 6 WAP. In glufosinate-resistant soybean, chlorophyll, nitrogenase activity, root respiration, plant biomass, and yield were not affected; seed nitrogen and protein were increased; seed oil content decreased. In glufosinate-sensitive soybean, glufosinate caused 28-32% injury and decreased 35-42% chlorophyll content within 3 d after treatment (DAT) but soybean completely recovered by 14 DAT. Glufosinate had no effect on plant biomass, nitrogenase activity, and root respiration in 2009 and inconsistent effects in 2010. In glufosinate-sensitive soybean, glufosinate had no effect on yield; increased leaf nitrogen, seed protein, and oleic acid; decreased oil content, linoleic, and linolenic acid. Glufosinate-sensitive soybean exposed to glufosinate drift may exhibit transient injury but soybean could recover without a yield penalty. Glufosinate altered seed composition in all soybean types.