Desempenho agronômico de soja, sob interferência de plantas infestantes

Souza, Renato Gomes de; Cardoso, Daniel Bonifácio Oliveira; Mamede, Morgana Coelho; Hamawaki, Osvaldo Toshiyuki; Sousa, Larissa Barbosa de

doi:10.32929/2446-8355.2019v28n2p194-203

Cited by 10 publications

(19 citation statements)

References 7 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%

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%

Weed Competition on Soybean Varieties from Different Relative Maturity Groups

et al. 2023

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“…The soybean cultivar DM 66i68 showed concave lines for RP and TRP, both for LA and DM, and values less than 1 in all simulations performed, which demonstrates its genetic differentiation in relation to the other cultivars (Table 1). Differentiation in competitive ability when involving soybean cultivars with weeds was also observed in early-cycle and late-cycle soybean cultivars (SOUZA et al 2019), and between soybean cultivars V-TOP RR and BMX Ativa RR (DIESEL et al 2020). Furthermore, HAMMER et al (2018 found that, among 40 soybean cultivars, the most modern and with the highest production capacity were more competitive in relation to older cultivars in a highly competitive environment.…”

Section: Resultsmentioning

confidence: 76%

Competitive ability of soybean cultivars with Ipomoea indivisa

Pazzini

Galon

Cavaletti

et al. 2022

Rev. Ciênc. Agrovet.

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Among the weeds that infest soybeans, the morning glory (Ipomoea indivisa) stands out for competing with water, light, nutrients and also interfering in the crop harvesting process. The aim of this study was to test the competitive ability of soybean cultivars in the presence of I. indivisa, in substitutive experiments. The experiments were carried out in a completely randomized design, with four replicates, using the soybean cultivars M 5838, DM 53i54, DM 57i52, DM 66i68, NS 5445, and NS 6601. A constant final yield for soybean and I. indivisa was observed with 24 plants per pot. Relative and total productivities were analyzed using diagrams applied to substitutive experiments with soybean and I. indivisa plants proportions of 24:0, 18:6, 12:12, 6:18, and 0:24 plants pot-1 (crop:weed). On 35 days after the emergence of the culture and the I. indivisa, the morphophysiological characteristics of the plants were assessed and the relative competitiveness indices were calculated considering the 50:50 plant ratio (12:12 plants pot-1). Morning glory affected the morphophysiological characteristics of soybean cultivars, demonstrating superior competitive ability for environmental resources. There was a competition between soybean cultivars and I. indivisa, which caused reductions in the shoot dry matter for both species. In this study, interspecific competition was more harmful than intraspecific competition.

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“…Thus, it is possible to affirm that when the crop and weeds are in early stages of development, there is no harmful competition for these individuals (Zandoná et al, 2018), which can be considered the period before interference. However, monitoring the crop since the emergence, through weed control in early stages, ensures better control of the infesting population (Agostinetto et al, 2009), considering that the increase of density of these plants, especially those of that develop at the beginning of the crop cycle, accentuate the competition for water, light and nutrients (Souza et al, 2019). The critical period of interference extended from 20 to 50 days.…”

Section: Resultsmentioning

confidence: 99%

Weed interference capacity on soybean yield

Rüdell

Petrolli

Santos

et al. 2021

Rev. Fac. Nac. Agron. Medellín

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Among biological factors, weeds are the most important limiting factor for crop yields, as well as increasing production costs. The aim was to determine the influence of control and coexistence of weed community on soybean crop yield and to define the period before interference, the critical period of interference prevention and the total period of interference prevention, with the comparative use of chemical and mechanical methods for weed eradication. The study was conducted in an experimental field in the 2018/2019 harvest. A randomized block with four replications was implemented as experimental design, using two methods for control. The evaluated periods were 0-10, 0-20, 0-30, 0-40, 0-50, 0-60 and 130 days after crop emergence. It was possible to observe that the use of the chemical method generated a higher yield compared to mechanical method. The period before the interference in both chemical and mechanical management was similar, approaching 20 days after crop emergence. The critical period of interference prevention was between 20-50 and 40.5 days after crop emergence in chemical and mechanical methods, respectively. The total period of interference prevention was extended to 50 and 40.5 days after crop emergence in chemical and mechanical methods, respectively. The reduction in productivity due to weed interference was 1639 kg ha-1 (55%)and 947 kg ha-1 (34.6%) in chemical and mechanical methods, respectively.

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Desempenho agronômico de soja, sob interferência de plantas infestantes

Cited by 10 publications

References 7 publications

Weed Competition on Soybean Varieties from Different Relative Maturity Groups

Weed Competition on Soybean Varieties from Different Relative Maturity Groups

Competitive ability of soybean cultivars with Ipomoea indivisa

Weed interference capacity on soybean yield

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