Sourgrass Interference on Soybean Grown in Brazilian Cerrado

Braz, Guilherme Braga Pereira; Cruvinel, Aline Guimarães; Caneppele, Alan Bruno; Takano, Hudson Kagueyama; Silva, Alessandro Guerra da; Oliveira, Rubem Silvério de

doi:10.1590/1983-21252021v34n211rc

Cited by 7 publications

(7 citation statements)

References 23 publications

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“…In contrast, the more significant growth of soybean plants, verified in the evaluation performed at 14 DAE in the treatments weeded after 20 DAE and without weeding, about the treatments weeded throughout the entire cycle and weeded up to 20 DAE, is a result of competition for light. This provoked the etiolation of the plants due to the shading imposed by the weeds, as reported in previous research [9,19].…”

Section: Resultssupporting

confidence: 75%

“…Mainly, these yield losses are due to the weed competition for space, water, light and nutrients, besides other effects such as allelopathy and the weeds serving as hosts for pests and diseases [7]. The intensity of weed competition may vary according to the density and composition of weed species present in the agricultural area, as well as the competitive ability of the variety used, soil and crop management practices, and the period of coexistence between the crop and weed community [5,[8][9][10]. Thus, the interference of weeds in the crop can cause reductions of up to 80% in grain yield [9].…”

Section: Introductionmentioning

confidence: 99%

“…The intensity of weed competition may vary according to the density and composition of weed species present in the agricultural area, as well as the competitive ability of the variety used, soil and crop management practices, and the period of coexistence between the crop and weed community [5,[8][9][10]. Thus, the interference of weeds in the crop can cause reductions of up to 80% in grain yield [9].…”

Section: Introductionmentioning

confidence: 99%

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Weed Competition on Soybean Varieties from Different Relative Maturity Groups

et al. 2023

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One factor limiting the achievement of high yields in the soybean crop is weed interference. The level of weed interference can vary according to the specificities of the weed community but also due to the agronomic characteristics of the soybean varieties. The objective of this work was to evaluate the effects of weed interference on soybean varieties of different relative maturity groups (RMG). A field experiment was implemented in a randomized complete block design, in a 3 × 4 factorial scheme, with five replications. The treatments were composed of the varieties BMX Flecha® (RMG 6.6), BMX Power® (RMG 7.3), and BMX Bônus® (RMG 7.9), associated with the following four weed managements: weeding throughout the cycle; weeded up to 20 days after emergence (DAE); weeded after 20 DAE until the end of soybean cycle; not weeded throughout the entire cycle. There was no interaction between the effects of the varieties and the weed management for emergence speed index, plant height, chlorophyll, first pod height insertion, plant population, thousand-grain weight and yield. The initial weed management caused changes in the composition of the weed community. The managements weeded throughout the cycle and weeded up until 20 DAE provided higher levels of chlorophyll and grain yield. The management without weeding during the entire cycle negatively influenced yield components. Late interventions in weed control, regardless of the soybean variety, result in yield losses.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weed Competition on Soybean Varieties from Different Relative Maturity Groups

et al. 2023

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“…Due to huge losses caused to crops and its difficulty of control, sourgrass [Digitaria insularis (L.) Mez ex Ekman] has drawn attention from Brazilian farmers in the last years (Braz et al, 2021;Silveira et al, 2018). Its high persistence in the environment because of rhizome formation and easy dispersion due to its high number of seeds with high germination percentage (Zambão et al, 2020) is aggravated by the glyphosate resistant biotypes (Takano et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The population density of Digitaria insularis influences Phaseolus vulgaris agronomic traits

Tomazini

Bittencourt

Bonome

et al. 2022

RSD

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The common bean (Phaseolus vulgaris L.) is an important species for human nutrition in Brazil and its cultivation has been hampered in recent years by the interference of sourgrass [Digitaria insularis (L.) Mez ex Ekman] populations. However, just a few studies evaluated sourgrass interaction with common beans. Therefore, we aimed to evaluate the influence of sourgrass density on common bean agronomic characteristics. Seven sourgrass densities, equivalent to populations from 0 to 12 plants m-², were established in a common bean crop field with a randomized block design and four replicates. The increase in sourgrass density boosted weed dry matter and the common bean plant’s height and leaf area index. Contrarily, the same increase in weed density reduced the crop chlorophyll content, stem diameter, shoot, root and total dry mass, and grain yield. The variables’ behavior testifies to the high sensitivity of the common bean to sourgrass interference reported by farmers. Variables such as common bean chlorophyll, stem diameter, and the shoot and root dry mass presented a strong negative correlation to the reduction in crop grain yield. The decrease in yield reached 69% with 12 sourgrass plants m-2 when compared to control. The density of 3.7 weed plants m-2 reduced the maximum common bean grain yield by half. Such significant results suggest the need for developing efficient sourgrass management methods and strategies to avoid common bean yield loss.

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“…Segundo Braz et al (2021), a massa seca da parte aérea da soja diminuiu em resposta ao aumento das densidades de capim amargoso. Sendo que a massa seca da soja diminuiu 55% sobre infestação de 8 plantas de capim amargoso por m 2 .…”

Section: Introductionunclassified

Regime Hídrico E Palha Influenciam Na Eficácia De Herbicidas Pré-Emergentes No Controle De Capim-Amargoso?

Barros

Silva

Meurer

et al. 2021

NAT

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O controle do capim-amargoso (Digitaria insularis (L.) Fedde) é um desafio na cultura da soja, e os herbicidas pré-emergentes surgem como opção de manejo. O objetivo desse trabalho foi avaliar o controle do capim-amargoso através de herbicidas pré-emergentes posicionados em diferentes regimes hídricos e quantidades de palha. O experimento foi realizado em casa de vegetação com delineamento experimental inteiramente casualizado em esquema fatorial 6 x 3, no primeiro fator alocou-se os regimes hídricos e no segundo os herbicidas pré-emergentes (diclosulam (29,4 g.i.a ha-1); flumioxazin + imazethapyr (50 + 106 g.i.a ha-1) e diuron + sulfentrazone (420 + 210 g.i.a ha-1)) esses fatores foram isolados para as quantidades de palha de milho + Brachiaria ruziziensis (0 e 3 t ha-1). Na aplicação diretamente no solo e sobre palha, o diclosulam apresentou as menores porcentagens de controle em todos os regimes hídricos com primeira chuva de 5 mm e segunda de 20mm. Já diuron + sulfentrazone e flumioxazin + imazethapyr não apresentaram diferenças significativas nos regimes hídricos controlando adequadamente o capim-amargoso. A eficácia do diclosulam sofreu influência dos intervalos de seca após a aplicação, diuron + sulfentrazone e flumioxazin + imazethapyr apresentaram um controle eficiente do capim-amargoso em todos os tratamentos.

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Sourgrass Interference on Soybean Grown in Brazilian Cerrado

Cited by 7 publications

References 23 publications

Weed Competition on Soybean Varieties from Different Relative Maturity Groups

Weed Competition on Soybean Varieties from Different Relative Maturity Groups

The population density of Digitaria insularis influences Phaseolus vulgaris agronomic traits

Regime Hídrico E Palha Influenciam Na Eficácia De Herbicidas Pré-Emergentes No Controle De Capim-Amargoso?

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