&lt;b&gt;Phytosociology of weed in the southwestern Goiás region

Santos, Weverton Ferreira; Procópio, S. de O.; Silva, Alessandro Guerra da; Fernandes, Marcelo Ferreira; Santos, Eduardo

doi:10.4025/actasciagron.v40i1.33049

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…The seeds of B. subalternans presented a high germination rate at a wide temperature range, varying from 15 to 35˚C during the day (Fig 1). This fact explicit the dispersion and infestation pattern of this species during all year in different Brazilian regions [19,20,21,22].…”

Section: Effect Of Temperature On Germinationsupporting

confidence: 64%

Seed germination of Bidens subalternans DC. exposed to different environmental factors

et al. 2020

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Bidens subalternans DC. is a weed found in several tropical countries such as Brazil. Large number of produced seeds and easy dispersion favor the colonization of agricultural fields by this species. To know the factors that affect the germination of B. subalternans can help to understand its ecology, permitting to develop control strategies. Laboratory experiments were carried out to evaluate how the temperature, photoperiod, burial depth, water deficit, and salt stress affect the seed germination of B. subalternans. The means of the treatments of each experiment were shown in scatter plots with the bars indicating the least significant difference (LSD, p�0.05). The results showed a germination percentage above 77% for a wide alternating temperature (15/20 C to 30/35 C night/day). The highest germination and uniformity occurred at 25/30˚C night/day. Only 11% of the seeds germinated at a temperature of 35/40˚C night/day. The deeper burial of seeds reduced their germination. Only 17% of the seeds germinated in darkness conditions. However, in constant light and 12 hours of light/dark conditions the germination percentage was over 96%, confirming the light dependence of the B. subalternans during germination. In constant light and 12 hours of light/dark, the germination was over 96%. B. subalternans seeds showed sensitivity to water and salt stress, and their germination was inhibited under a water potential of-0.4 MPa and 100.09 mM, respectively. The sensitivity of B. subalternans seeds to high temperatures, water stress, and salt stress explains the high frequency of this weed in south-central Brazil. The light and sowing depth showed that burial of seeds by mechanical control is a strategy to reduce the high infestation of B. subalternans.

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Section: Effect Of Temperature On Germinationsupporting

confidence: 64%

Seed germination of Bidens subalternans DC. exposed to different environmental factors

et al. 2020

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“…These data demonstrate that the initial weeding enhanced the representation of A. tenella and E. indica, reducing the participation of E. hirta in the composition of the weed community. It is important to highlight that among the species found, A. tenella is among the most present weeds in Brazilian crop fields, mainly in the Cerrado region [28], and its principal characteristic is rapid dissemination. The species E. indica is characterized as an autogamous plant with an annual cycle with a high capacity to produce seeds, which can remain in the soil for long periods in dormancy [29].…”

Section: Resultsmentioning

confidence: 99%

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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“…Opções de herbicidas para o controle desta planta daninha são bem-vindas, devido as dificuldades de controle relatadas sobretudo para a aplicação de glifosato e sua ocorrência em importantes regiões agrícolas do Brasil (Fadin et al, 2018;Santos et al, 2018;Lucio et al, 2019). Neste contexto deve ser destacado o estádio das plantas no momento da aplicação, no estádio de 4-6 folhas e floração, as superfícies das folhas adaxiais apresentaram menos estômatos e mais tricomas, em relação às plantas no estádio de 2-4 folhas (Fadin e Monquero, 2019), o que pode resultar em uma menor absorção de herbicidas, o que ajuda a explicar a menor eficácia em estádios mais avançados (Fadin et al, 2018).…”

Section: Tratamentounclassified