Densidades de plantas daninhas e épocas de controle sobre os componentes de produção da soja

Silva, A.F.; Ferreira, E.A.; Concenço, Germani; Ferreira, F.A.; Aspiazú, Ignácio; Galon, Leandro; Silva, A.A.

doi:10.1590/s0100-83582008000100007

Cited by 39 publications

(39 citation statements)

References 18 publications

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“…These results corroborate those found by Silva et al (2008) and Pittelkow et al (2009), who have also observed a reduction of pods in soybean plants as they increased the intensity of interference imposed by the weed community to the culture. However, for the thousand grain weight, differences were not observed between the coexistence and control periods (Figure 6), corroborating the results by Duarte (2009), which conclude that this characteristic has greater individual control and is intrinsically related to the cultivar sown, with low variation amplitude by environmental stimuli.…”

Section: Resultssupporting

confidence: 92%

“…Similar results were found by Silva et al (2008) evaluating weed densities and control periods on soybean yield components. According to Meschede et al (2004), the accumulated dry matter proves to be more important than the weeds density in relation to the degree of interference imposed on soybeans, and displays an inverse correlation to the yield components of this culture.…”

Section: Resultssupporting

confidence: 85%

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Interference Periods Among Weeds and Soybean Rr Tm Crops in the Western Center Area of the Brazilian State of Paraná

et al. 2015

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-One of the factors that can influence soybeans yield is the interference imposed by weeds. This research has aimed to determine the critical period of weed interference on cv. INT 6100 RR TM soybeans. The experiment was conducted under field conditions at Campo Mourão County, Parana State, in the 2013/2014 harvest, using randomized blocks, arranged in a 2 x 8 factorial, with four replications. In the first factor, the coexistence (period before weed interference) and control (total period of weed interference prevention) periods were assessed. The second factor consisted of management times of weed species (0, 7, 14, 28, 35, 49, 56 and 130 days after emergence -DAE). The evaluations performed were density and shoot dry matter of the weed community, height, number of pods, thousand grain weight and soybean yield. Among the weed species in soybean crops, there was predominance of eudicotyledonous ones (82%). The yield results allowed establishing, for cv. INT 6100 RR TM soybeans at Campo Mourão County, Parana State, a critical period for preventing interference between 24-38 DAE.Keywords: coexistence, weed control, competition, Glycine max. daninhas: 0, 7, 14, 28, 35, 49, 56 e 130 (ciclo todo) RESUMO -Um dos fatores que podem influenciar a produtividade da cultura da soja é a interferência imposta pelas plantas daninhas. A pesquisa teve como objetivo determinar o período crítico de prevenção à interferência das plantas daninhas

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 85%

Interference Periods Among Weeds and Soybean Rr Tm Crops in the Western Center Area of the Brazilian State of Paraná

et al. 2015

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“…For periods of coexistence, it was verified that NGP was not altered until 156 DAE (Table 3). Another study with soybean showed reductions on the number of pods per plant, of pod grains and pod per area, due to the interference of weeds (Silva et al, 2008). TGM differed only between the periods of coexistence and it was not significantly altered until 28 DAE.…”

Section: Resultsmentioning

confidence: 94%

“…However, it did not differ in the TGM observed during the period of coexistence with crabgrass up until the end of the crop's cycle (156 DAE). According to Silva et al (2008), the soybean TGM reduction depends on the intensity of competition for environmental resources, being altered from the first days of coexistence when there's a high infestation on the area. ABP and HI differed between control and coexistence only on 156 DAE, being the lower values resulted from the coexistence of soybean with crabgrass until 156 DAE (Table 4).…”

Section: Resultsmentioning

confidence: 99%

Competition periods of crabgrass with rice and soybean crops

et al. 2014

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-Determining the periods of weed competition with crops helps the producer to choose the most appropriate time to use weed control practices. This strategy allows for the reduction of the number of herbicide applications, reducing costs and the environmental impact of pesticides. The objectives were to determine the period before the interference (PBI) of crabgrass (Digitaria ciliaris) competing with flooded rice, the critical period of interference prevention (CPIP) of crabgrass with soybean and the effects of competition on the grains yield and their components. Experiments were conducted with the coexistence of BRS Querência rice cultivar with crabgrass, for periods of 0, 7, 14, 21, 28, 35, and 110 days after emergency (DAE) and Fundacep 53RR soybean cultivar, whose periods of coexistence and control of crabgrass were 0, 7, 14, 21, 28, 35, and 156 DAE. Rice can grow with crabgrass infestation until 18 DAE, while soybean should remain free from the presence of crabgrass in the period between 23 and 50 DAE. The grain yield and its components, in the crops studied, are affected when grown with crabgrass. BRS Querência, com milhã, por períodos iniciais crescentes de 0, 7, 14, 21, 28, 35 Keywords: Digitaria ciliaris, Oryza sativa, Glycine max, interference RESUMO -A determinação dos períodos de competição das plantas daninhas com as culturas auxilia o produtor na escolha do momento mais adequado para utilizar medidas de manejo. Essa estratégia possibilita reduzir o número de aplicações de herbicidas, com consequente redução de custo e menor impacto dos agrotóxicos ao ambiente. Assim, os objetivos deste trabalho foram determinar o período anterior à interferência (PAI) de milhã (Digitaria ciliaris) na cultura do arroz irrigado, o período crítico de prevenção à interferência (PCPI) de milhã na cultura da soja e os efeitos da competição na produtividade de grãos e seus componentes. Para isso, foram conduzidos experimentos de convivência de arroz irrigado, cultivar

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“…Species such as Brachiaria decumbens compete with crops for physical space, promote competition for environment resources such as water, light and nutrients, may be hosts for pests and diseases, and interfere with the harvesting process by reducing the speed of movement of harvesters or even by clogging them (SILVA et al, 2008;2009).…”

Section: Introductionmentioning

confidence: 99%

Action of rain on formulations of glyphosate mixed with saflufenacil for the control of Brachiaria decumbens

et al. 2018

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RESUMO:O objetivo do trabalho foi avaliar a ocorrência de chuvas na eficiência de diferentes formulações de glyphosate aplicadas de forma isolada e em mistura com o saflufenacil, sobre o controle de Brachiaria decumbens. O estudo foi realizado no primeiro semestre de 2013. Os tratamentos constaram da aplicação isolada de três formulações de glyphosate (Roundup Original, Roundup Transorb R e Roundup WG) a 1.080 g e.a. ha -1 e em mistura com o saflufenacil a 24,5 g i.a. ha -1 + Dash a 0,5% v/v e, seis intervalos de tempo para simulação da chuva: 15; 30; 60; 120; 240 e 360 minutos após a aplicação dos herbicidas e uma testemunha sem chuva. Foram realizadas avaliações visuais de controle das plantas aos 4; 7; 14; 21 e 28 dias após a aplicação dos herbicidas. A mistura de saflufenacil + Dash às formulações de Roundup original, Roundup transorb R e Roundup WG aumentaram a velocidade de controle das plantas de B. decumbens, independente do intervalo de chuva estudado. As formulações de glyphosate (Roundup Transorb R e Roundup WG) aplicados isolados foram afetadas por chuvas que ocorreram logo após a pulverização e quando em mistura com saflufenacil + Dash observou-se efeito sinérgico no controle das plantas daninhas. PALAVRAS-CHAVE:Brachiaria; eficácia; herbicida; plantas daninhas. ABSTRACT:This study aimed to evaluate the effects of rain on the efficiency of different formulations of glyphosate applied in isolation and in combination with saflufenacil on the control of Brachiaria decumbens. This study was conducted during the first half of 2013. The treatments consisted of an isolated application of three formulations of glyphosate (Roundup Original, Roundup Transorb R, and Roundup WG) at 1,080 g a.e. ha -1 and mixed with saflufenacil at 24.5 g a.e. ha -1 + Dash at 0.5% v/v at six time intervals of simulated rain: 15, 30, 60, 120, 240 and 360 minutes after application of herbicides and a control treatment without rain. We performed visual evaluations of plant control at 4, 7, 14, 21 and 28 days after application of herbicides. The mixture of saflufenacil + Dash with the original Roundup formulations, Roundup Transorb R and Roundup WG increased the control speed of B. decumbens plants regardless of the rain interval studied. The formulations of glyphosate (Roundup Transorb R and Roundup WG) applied in isolation were affected by rains that occurred shortly after spraying. In combination with saflufenacil + Dash, there was a synergistic effect on weed control.

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Densidades de plantas daninhas e épocas de controle sobre os componentes de produção da soja

Cited by 39 publications

References 18 publications

Interference Periods Among Weeds and Soybean Rr Tm Crops in the Western Center Area of the Brazilian State of Paraná

Interference Periods Among Weeds and Soybean Rr Tm Crops in the Western Center Area of the Brazilian State of Paraná

Competition periods of crabgrass with rice and soybean crops

Action of rain on formulations of glyphosate mixed with saflufenacil for the control of Brachiaria decumbens

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