Auxin‐based herbicide program for weed control in auxin resistant soybean

Amajioyi, Joy; Nleya, Thandiwe; Reicks, Graig; Moriles‐Miller, Janet; Clay, D. V.; Clay, Sharon A.

doi:10.1002/agg2.20299

Cited by 3 publications

(3 citation statements)

References 53 publications

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“…Late‐planted soybean supported by a herbicide program with EPOST + MPOST applications increased the level of weed control by 10% compared to EPOST alone but could not overcome a 29% gap in weed control compared to early‐ and delayed‐planted soybean with an EPOST + MPOST program (Figure 6). A similar study in South Dakota found planting Xtend soybean 2 weeks later than the recommended PD resulted in plants with 20%–50% less biomass, fewer nodules, and reduced yields (Amajioyi et al., 2022). The gap in weed control between late‐planted soybean compared to early‐ and delayed‐planted soybean with the same herbicide program indicates a threshold between soybean at a delayed planting producing enough biomass to shade the soil surface and suppress later emerging weeds while late‐planted soybean had insufficient canopy growth to provide cultural control (Arsenijevis et al., 2022; Mickelson & Renner, 1997).…”

Section: Resultsmentioning

confidence: 95%

Planting date and dicamba‐based herbicide programs influence soybean production in the Southern Great Plains

Kezar,

Kankarla,

Lofton

2024

Agrosystems Geosci & Env

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The interplay of management decisions involving soybean (Glycine max L.) planting date, herbicide programs, and herbicide application timings is critical to optimize soybean performance and weed control in Southern Great Plains soybean production systems. This research sought to evaluate soybean yield potential and the level of weed control as influenced by early‐, delayed‐, and late‐ planting dates and various combinations of preemergence (PRE), early‐postemergence (EPOST), and mid‐postemergence (MPOST) weed management programs. A field study was established in Bixby, OK in 2017 and 2018 under irrigated conditions and in Perkins, OK in 2017 under dryland conditions, consisting of three planting windows (early, delayed, and late) of XtendFlex soybean, with or without a PRE (chlorimuron + flumioxazin + pyroxasulfone + glyphosate + dicamba) combined with EPOST or EPOST + MPOST (glyphosate + dicamba) versus no in‐season applications. The gap in late‐planted soybean yield potential, compared to early‐planted soybean, was exacerbated in the dryland systems (1346 kg ha−1) versus an irrigated system (2311 kg ha−1). Use of PRE provided 60% weed control until MPOST and increased yields by 657 kg ha−1 and 457 kg ha−1 for delayed and late‐planted soybean, respectively. Late‐planted soybean with EPOST + MPOST provided up to 50% weed control, but lack of biomass production for cultural control reduced weed control by 29% compared to early‐ and delayed‐planted soybean. From an agronomic management standpoint, the time of soybean planting is influential on the success of weed control measures and soybean yields in double‐cropping system in the Southern Great Plains, particularly with late‐planted soybean.

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Section: Resultsmentioning

confidence: 95%

Planting date and dicamba‐based herbicide programs influence soybean production in the Southern Great Plains

Kezar,

Kankarla,

Lofton

2024

Agrosystems Geosci & Env

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“…Treatments were (1) B. japonicum, strain USDA 110, in deionized water alone, and mixed with solutions of (2) herbicides used at labeled rates; (3) spray additives; and (4) herbicides mixed with spray additives. Rhizobia growth was monitored every 24 h over a 72-h period (Amajioyi, 2021). One hundred milliliters of stock solutions for treatments 2, 3, and 4 were prepared using milliQ-water (Millipore Sigma Corp.).…”

Section: Methodsmentioning

confidence: 99%

Herbicide and additive impacts on Bradyrhizobium japonicum growth in solution

Amajioyi,

Nleya,

Subramanian

et al. 2023

Agrosystems Geosci & Env

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Plant biostimulants include beneficial fungi and bacteria, and are often applied to foliage to improve crop growth, yield, and/or crop quality. Crop improvements due to biostimulant addition may be modest; therefore, solo applications may not be economical or climate smart. However, biostimulants combined with other postemergence treatments, such as herbicides, may provide an alternative application method, if mixtures do not harm the living organism(s). The growth of Bradyrhizobium japonicum, as a biostimulant surrogate, was assessed in solutions of glyphosate [N‐(phosphonomethyl)glycine] and dicamba (3,6‐dichloro‐2‐methoxybenzoic acid), with and without common spray additives (ammonium sulfate [AMS] and nonionic surfactant) in laboratory studies over 72 h. Solution turbidity, using optical density as a surrogate of bacterial growth, was measured at 600 nm at 24, 48, and 72 h after inoculation, and colony forming units (CFUs) per milliliter were estimated. Growth was not detected in either the glyphosate or AMS solutions, most likely due to the low pH and high electrical conductivity of the solutions, respectively. When herbicides were mixed with a nonionic surfactant, CFUs per milliliter were about 25% greater than the positive control. These data suggest that mixing bacteria with postemergence herbicide + surfactants/additives combinations can hinder or maintain growth when preparing for agrochemical applications. Biostimulant type and the agrichemical combination(s) should be evaluated prior to tank mixing to determine if detrimental interactions occur. After application, an evaluation of the effectiveness of the biostimulant to the crop and efficacy of the agrichemical to the target organism should be conducted.

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“…Clethodim (CAS nº 99129-21-2) is used for common bean (Phaseolus vulgaris) production [14] as a post-emergence herbicide for the control of monocotyledonous weeds, Plants 2023, 12, 1608 2 of 14 and its use has increased due to the development of resistance of some grasses to the most widespread herbicide, glyphosate. Clethodim is a cyclohexanedione oxime herbicide, highly water-soluble and poorly adsorbed in soil, which may move into water bodies as a potential contaminant [15,16] causing developmental toxicity in fishes [17]. Additionally, despite the photosensitivity of this compound, photodegraded solutions of clethodim have been shown to be more toxic than the herbicide itself, reaching the maximum toxicity when the herbicide is completely degraded [18].…”

Section: Introductionmentioning

confidence: 99%

Reduction in the Use of Some Herbicides Favors Nitrogen Fixation Efficiency in Phaseolus vulgaris and Medicago sativa

Paniagua-López

Jiménez-Pelayo

Gómez-Fernández

et al. 2023

Plants

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In recent decades, the quality of agricultural soils has been seriously affected by the excessive application of pesticides, with herbicides being one of the most abundant. Continuous use of herbicides alters the soil microbial community and beneficial interactions between plants and bacteria such as legume-rhizobia spp. symbiosis, causing a decrease in the biological nitrogen fixation, which is essential for soil fertility. Therefore, the aim of this work was to study the effect of two commonly used herbicides (pendimethalin and clethodim) on the legume-rhizobia spp. symbiosis to improve the effectiveness of this process. Phaseolus vulgaris plants grown in pots with a mixture of soil:perlite (3:1 v/v), showed a 44% inhibition of nitrogen fixation rate with pendimethalin. However, clethodim, specifically used against monocots, did not induce significant differences. Additionally, we analyzed the effect of herbicides on root exudate composition, detecting alterations that might be interfering with the symbiosis establishment. In order to assess the effect of the herbicides at the early nodulation steps, nodulation kinetics in Medicago sativa plants inoculated with Sinorhizobium meliloti were performed. Clethodim caused a 30% reduction in nodulation while pendimethalin totally inhibited nodulation, producing a reduction in bacterial growth and motility as well. In conclusion, pendimethalin and clethodim application reduced the capacity of Phaseolus vulgaris and Medicago sativa to fix nitrogen by inhibiting root growth and modifying root exudate composition as well as bacterial fitness. Thus, a reduction in the use of these herbicides in these crops should be addressed to favor a state of natural fertilization of the soil through greater efficiency of leguminous crops.

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Auxin‐based herbicide program for weed control in auxin resistant soybean

Cited by 3 publications

References 53 publications

Planting date and dicamba‐based herbicide programs influence soybean production in the Southern Great Plains

Planting date and dicamba‐based herbicide programs influence soybean production in the Southern Great Plains

Herbicide and additive impacts on Bradyrhizobium japonicum growth in solution

Reduction in the Use of Some Herbicides Favors Nitrogen Fixation Efficiency in Phaseolus vulgaris and Medicago sativa

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