Período anterior à interferência na cultura da soja-RR em condições de baixa, média e alta infestação

Silva, A.F.; Concenço, Germani; Aspiazú, Ignácio; Ferreira, Evander Alves; Galon, Leandro; Freitas, M.A.M.; Silva, A.A.; Ferreira, F.A.

doi:10.1590/s0100-83582009000100009

Cited by 37 publications

(31 citation statements)

References 10 publications

(10 reference statements)

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“…However, it was at 14 DAE that the highest densities were reached, and, as the soybean crop was developing, there was a reduction of the weed population. Similar results were obtained by Silva et al (2009), who found a reduction of weed density at 33 and 28 DAE for soybeans grown in medium and high infestation, respectively. According to Tavares et al (2012), this is due to the closing of the soybean canopy, which restricted the emergence of new weeds through shading, thereby exerting crop control.…”

Section: Resultssupporting

confidence: 89%

“…For Jannink et al (2000), early soybean cultivars have a stronger initial growth and increased competitiveness in this development stage. Silva et al (2009) have mentioned that the culture, while in competition for light, tends to increase its height (shading), in order to improve the capture of radiation and shade weeds. This is the first symptom of the competition and, according to Vidal (2010), it occurs primarily not by shading, but by light reflected (wavelength -red) by the weeds.…”

Section: Resultsmentioning

confidence: 99%

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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: 89%

Section: Resultsmentioning

confidence: 99%

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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“…The maximum period that crop was able to tolerate weed infestation without yield decrease was 17 and 11 days for low and high infestation respectively (Silva et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Selectivity of glyphosate in tank mixtures for RR soybean in sequential applications with mixtures only in the first or second application

et al. 2010

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Tank mixtures among herbicides of different action mechanisms might increase weed control spectrum and may be an important strategy for preventing the development of resistance in RR soybean. However, little is known about the effects of these herbicide combinations on soybean plants. Hence, two experiments were carried out aiming at evaluating the selectivity of glyphosate mixtures with other active ingredients applied in postemergence to RR soybean. The first application was carried out at V1 to V2 soybean stage and the second at V3 to V4 (15 days after the first one). For experiment I, treatments (rates in g ha-1) evaluated were composed by two sequential applications: the first one with glyphosate (720) in tank mixtures with cloransulam (30.24), fomesafen (125), lactofen (72), chlorimuron (12.5), flumiclorac (30), bentazon (480) and imazethapyr (80); the second application consisted of isolated glyphosate (480). In experiment II, treatments also consisted of two sequential applications, but tank mixtures as described above were applied as the second application. The first one in this experiment consisted of isolated glyphosate (720). For both experiments, sequential applications of glyphosate alone at 720/480, 960/480, 1200/480 and 960/720 (Expt. I) or 720/480, 720/720, 720/960 and 720/1200 (Expt. II) were used as control treatments. Applications of glyphosate tank mixtures with other herbicides are more selective to RR soybean when applied at younger stages whereas applications at later stages might cause yield losses, especially when glyphosate is mixed with lactofen and bentazon.

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“…Em soja, cultivares precoces e de porte baixo apresentam baixa capacidade de competição e os cultivares tardios e de porte alto são mais competitivos com plantas daninhas (Lamego et al, 2004). O período anterior à interferência (PAI) altera-se significativamente com o incremento da densidade de plantas daninhas (Silva et al, 2009a).…”

Section: Introductionunclassified

Alteração do período anterior à interferência da soja na presença de plantas voluntárias de milho

2014

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Resumo -Objetivou-se com este trabalho caracterizar o início da interferência de plantas daninhas em dois cultivares de soja, com ciclo de crescimento distinto, sob duas condições de infestação de plantas de milho. O delineamento experimental foi blocos casualizados, em esquema de parcelas subdivididas, composto por dois fatores: períodos de convivência da soja com o milho (sem convivência, convivência por 14, 28 e 42 dias após a semeadura (DAS) e por todo o ciclo da cultura) e densidades de plantas de milho, 10 plantas m -2 e 30 plantas m -2. O cultivar Fundacep 63RR sofreu alterações no crescimento em períodos iguais ou superiores a 42 DAS, independente das populações de plantas de milho. A redução na produtividade de grãos de soja ocorreu aos 28 DAS para a população de 10 plantas m -2 e aos 14 DAS para a população de 30 plantas m -2 . No cultivar Fundacep 59RR, as alterações nas características morfológicas nas plantas de soja ocorreram em períodos de convivência iguais ou superiores a 28 DAS e a população de plantas de milho de 30 plantas m -2 alterou a estatura e o número de ramos aos 60 DAS. Neste cultivar a redução de produtividade iniciou aos 42 DAS para a população de 10 plantas m -2 e aos 28 DAS para a população de 30 plantas m -2 de milho. Palavras-chaves: competição, convivência, Glycine max, Zea maysAbstract -The aim of this work was to characterize the onset of weed interference in two soybean cultivars, with different growth cycle, under two conditions of corn plants infestation. The experimental design was split plot design composed by two factors: periods of coexistence of soybean with corn (no coexistence, coexistence during 14, 28 and 42 days after sowing (DAS) and throughout the soybean cycle) and two corn densities: 10 plants m -2 and 30 plants m -2 . The cultivar Fundacep 63RR had its growth altered in period equal or longer than 42 DAS with no relation to corn populations. The reduction in grain yield of soybean occurred at 28 DAS for 10 plants m

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Período anterior à interferência na cultura da soja-RR em condições de baixa, média e alta infestação

Cited by 37 publications

References 10 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

Selectivity of glyphosate in tank mixtures for RR soybean in sequential applications with mixtures only in the first or second application

Alteração do período anterior à interferência da soja na presença de plantas voluntárias de milho

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