Effects of timing of weed removal and application of pre-emergence herbicides on growth of soybeans

Pavlović, Pavle B.; Osipitan, Adewale; Knežević, Stevan Z.

doi:10.5937/actaherb1801035p

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…However, with atrazine, a 5% reduction in corn biomass occurred when weeding did not occur until the V4 stage (162 GDD) or until the V5 stage (215 GDD) in 2017 and 2018, respectively; and a further time until weed removal to the V7 growth stage (302 to 323 GDD) occurred with saflufenacil/dimethenamid-P þ pyroxasulfone. A previous study also demonstrated that application of a PRE herbicide substantially delayed the 5% biomass reduction in soybean until the V5 stage compared with the V1 stage without PRE herbicide (Pavlović et al 2018). Any management input that impacts weed interference would likely influence crop growth (as measured by LAI and biomass in this case) with subsequent influence on crop yield; and crop yield is the basis for estimating CTWR (Hall et al 1992).…”

Section: Corn Leaf Area Index and Biomassmentioning

confidence: 82%

“…The PRE application of saflufenacil/dimethenamid-P þ pyroxasulfone prevented a reduction in LAI even in season-long delayed weed removal (Figure 1). A similar study in soybean indicated that the effect of season-long weed interference on soybean LAI was 38% with PRE application of sulfentrazone þ imazethapyr compared with 71% reduction without PRE herbicide (Pavlović et al 2018). Similar to LAI, corn biomass was greater in 2018 than in 2017.…”

Section: Corn Leaf Area Index and Biomassmentioning

confidence: 92%

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PRE herbicides influence critical time of weed removal in glyphosate-resistant corn

et al. 2020

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Residual herbicides applied PRE provide early season weed control, potentially avoid the need for multiple POST herbicides, and can provide additional control of herbicide-resistant weeds. Thus, field studies were conducted in 2017 and 2018 at Concord, NE, to evaluate the influence of PRE herbicides on critical time for post-emergence weed removal (CTWR) in corn. The studies were arranged in a split-plot design that consisted of three herbicide regimes as main plot treatments and seven weed removal timings as subplot treatments in four replications. The herbicide regimes included no PRE herbicide, atrazine, and a premix of saflufenacil/dimethenamid-P mixed with pyroxasulfone. The weed removal timings were at V3, V6, V9, V12, and V15 corn growth stages and then plots were kept weed-free until harvest. A weed-free and nontreated control were included for comparison. The relationship between corn growth or yield, and weed removal timings in growing degree days (GDD) was described by a four-parameter log-logistic model. This model was used to estimate the critical time for weed removal based on 5% crop yield loss threshold. A delay in weed removal until V2 to V3 corn growth stage (91 to 126 GDD) reduced corn biomass by 5% without PRE herbicide application. The CTWR started at V3 without PRE herbicide in both years. Atrazine delayed the CTWR up to V5 in both years, while saflufenacil/dimethenamid-P plus pyroxasulfone further delayed the CTWR up to V10 and V8 corn growth stage in 2017 and 2018 respectively. Herbicide applied PRE particularly with multiple sites of action can delay the CTWR in corn maximum up to V10 growth stage, and delay or reduce the need for POST weed management.

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Section: Corn Leaf Area Index and Biomassmentioning

confidence: 82%

Section: Corn Leaf Area Index and Biomassmentioning

confidence: 92%

PRE herbicides influence critical time of weed removal in glyphosate-resistant corn

et al. 2020

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“…), koštan (Echinochloa crus-galli L.), vilina kosica (Cuscuta spp. Dodd) i druge (Pavlović et al, 2004;Konstantinović i Meseldžija, 2005a;Vrbničanin i Božić, 2021).…”

Section: Uvodmentioning

confidence: 99%

Evaluation of herbicide effectiveness in weed control in alfalfa

Vasić,

Živković

2023

Acta herbologica

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Alfalfa is one of the most important perennial fodder crops, and it is also the most economical. Alfalfa provides first class fodder that is suitable for feeding all livestock, especially ruminants. Grass and broadleaf weeds are a serious threat to the quality and viability of alfalfa stands. Weeds can reduce the nutritional value of the crop and cause significant reductions in yield, as they compete aggressively for water, nutrients, sunlight, and space. In this study, herbicides (Butoxone DB, Agil, Basagran, Corum, Fusilade forte, Pulsar and Focus ultra) were used for controlling weeds in alfalfa. The presence of annual and perennial weeds, typical of alfalfa plantations: Capsella bursa-pastoris, Stellaria media, Lamium amplexicaule, Viola arvensis, Amaranthus retroflexus, Setaria spp., Sorghum halepense, Cirsium arvense, Plantago lanceolate, Rumex crispus and others, was observed on the tested surfaces. Our research has shown that the most effective herbicides are Basagran, Butoxone DB and Corum, which are intended to suppress broadleaf weeds. Meanwhile, herbicides Fusilade forte and Pulsar proved to be very effective in controlling grass weeds. A very good reaction was also observed with the combinations of herbicides Pulsar + Fusilade forte and Pulsar + Basagran, as these combinations expand the spectrum of activity to the grass and broadleaf weeds. The aim of this paper was to determine which herbicide is most effective in controlling weeds in alfalfa.

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“…Application of pre.em. herbicides, separately, could not complete protection of soybeans during the longer period from three to four weeks, so there is a need for use of foliar herbicides (alone or in combinations) [39]. Significant differences between the control, the untreated variant, and treated variants in terms of herbicides efficacy were observed (Tables 5 and 6), which indicates the efficacy of the applied combination of herbicides, due to the fact that a larger number of weeds per m 2 was observed on the control plot than on the treated surfaces.…”

Section: First Assessment Second Assessmentmentioning

confidence: 99%

Economic Feasibility of Chemical Weed Control in Soybean Production in Serbia

et al. 2020

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The aim of this study was to investigate the efficacy and phytotoxicity of herbicides in combinations and to determine their economic feasibility in the soybean crop. The trials were placed at two locations, Pobeda and Budisava (Serbia), during 2016 and 2018, organized in a randomized block design with four replicates of all herbicide combinations (metribuzin + S-metolachlor; imazamox + oxasulfuron + typhenesulfuron-methyl; metribuzin + S-metolachlor + imazamox + oxasulfuron + typhenesulfuron-methyl; and bentazon + imazamox + typhenesulfuron-methyl). At the first location, 16 weed species were determined, while in the second location, 14 were determined. The highest reduction in the number of weeds was achieved at the first location, using a combination of herbicides metribuzin + S-metolachlor + imazamox + oxasulfuron + typhenesulfuron-methyl with a total efficacy that ranged from 96.98% to 97.40%. Only on the second location bentazone + imazamox + tifensulfuron-methyl showed passable phytotoxicity on soybean, during both years. Based on the established economic justification, in the combinations of metribuzin + S-metolachlor + imazamox + oxasulfuron + typhenesulfuron-methyl, yield was increased for 2350 kg/ha or 1.91 times more, according to the untreated variant at first location. The economic injury level at the most effective combination of herbicides was 52.70 weeds/m 2 .Soybean (Glycine max (L.) Merr.) is a wonder crop of the twentieth-century and an important source of protein and vegetable oil for human and animal consumption. Today, the largest soybean producers of the world are the USA, Brazil, and Argentina [6,7]. The soybean contains approximately 40%-45% protein and 18%-22% oil, and it is a rich source of vitamins and minerals, with a favourable composition of the amino acids. For this reason, soybean is recommended for use in human consumption as a part of cholesterol-free diets [8]. In addition to this, soybean can improve soil fertility by fixing atmospheric nitrogen from the air [9], and its oil is being used for biodiesel [10]. In the semiarid and subhumid regions of the world, water stress is a major factor limiting soybean production [11]. In our country, climate has a great impact on plant growth and development, so light, heat, air, and water often represent limiting factors [12]. Economic feasibility and selection of most effective measures in weed management, during the crop season, can be the key to maximizing yields. Serbia has favorable conditions for growing soybeans though proper cultivation technology, and selection of variety is a prerequisite for economically viable soybean production. In 2016, average soybean yields in Serbia were at the level of world yields average, while production amounted to 576,446.00 t [13].Heavy weed infestations in soybeans highly interfere with the timeliness and efficiency of harvests, and if not controlled, cause severe losses in crops [14]. In soybean production, almost 37% of attainable production is endangered by weed competition compared to pathoge...

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Effects of timing of weed removal and application of pre-emergence herbicides on growth of soybeans

Cited by 4 publications

References 11 publications

PRE herbicides influence critical time of weed removal in glyphosate-resistant corn

PRE herbicides influence critical time of weed removal in glyphosate-resistant corn

Evaluation of herbicide effectiveness in weed control in alfalfa

Economic Feasibility of Chemical Weed Control in Soybean Production in Serbia

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