• DOI:10.2134/AGRONJ2015.0505
• Corpus ID: 86883126

Growth Regulation with Lactofen Does Not Affect Seed Yield of Irrigated Soybean

@article{Mangialardi2016GrowthRW,
  title={Growth Regulation with Lactofen Does Not Affect Seed Yield of Irrigated Soybean},
  author={Joseph Paul Mangialardi and John M. Orlowski and Benjamin H. Lawrence and Jason A. Bond and Bobby R. Golden and Angus L. Catchot and Jimmy D. Peeples and Thomas W. Eubank},
  journal={Agronomy Journal},
  year={2016},
  volume={108},
  pages={1112-1115}
}

• J. P. Mangialardi, J. Orlowski, +5 authors Thomas W. Eubank
• Published 1 May 2016
• Biology
• Agronomy Journal

Agronomy Journa l • Volume 108 , I s sue 3 • 2016 Lactofen and other diphenyl ether herbicides such as fomesafen are used in soybean production in the midsouthern United States, for control of broadleaf weeds (Kapusta et al., 1986; Wichert and Talbert 1993), particularly glyphosate [N-(phosphonomethyl) glycine] and acetolactate synthase (ALS)-resistant Palmer amaranth (Amaranthus palmeri S. Wats) (Norsworthy et al., 2008). When lactofen is applied postemergence, the herbicide is absorbed into plant tissue where it inhibits protoporphyrinogen oxidase (PPO) enzymes resulting in breakdown of cell membranes causing loss of turgor pressure and cell death in susceptible plants (Graham, 2005). Although lactofen is labeled for use in soybean, application results in severe bronzing and necrosis on exposed soybean tissue which can persist for a number of weeks (Kapusta et al., 1986). It has been hypothesized that the damaged caused by lactofen can have benefi cial eff ects on high-yielding soybean. It has been hypothesized that the damage caused by lactofen stunts soybean resulting in decreased plant height. Decreasing plant height in vigorous, high-yielding soybean can reduce yield losses associated with lodging (Wilcox and Sediyama, 1981). It has also been hypothesized that the damage caused by lactofen can potentially damage or kill the apical meristem of the soybean plant, stimulating lateral branching and increasing soybean node number (Orlowski et al., 2016). Recent research in the upper midsouthern United States (Kentucky) reported that early-season (V1–V4) (Fehr and Caviness, 1977) lactofen application limited eff ects on soybean morphology and yield components and did not increase soybean seed yield (Gregg et al., 2015; Orlowski, 2015; Orlowski et al., 2016). However, soybean management in Kentucky is far more similar to non-irrigated midwestern U.S. production systems than the furrow-irrigated systems common in the lower midsouthern United States (Mississippi River Delta). Aside from being furrow-irrigated, soybean in the midsouthern United States are planted much earlier than midwestern U.S. soybean, generally in early to mid-April to avoid harsh environmental conditions during reproductive growth (Heatherly and Spurlock, 1999). Th e early planting system coupled with supplemental irrigation results in seed yields (>5.3 Mg ha–1) being achieved by producers well above the national average (3.1 Mg ha–1). Th e purpose Growth Regulation with Lactofen Does Not Affect Seed Yield of Irrigated Soybean