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

Silva, A.A.P.; Neto, Antonio Mendes Oliveira; Guerra, Naiara; Helvig, Enelise Osco; Maciel, Cleber Daniel de Goes

doi:10.1590/s0100-83582015000400009

Cited by 6 publications

(7 citation statements)

References 14 publications

(15 reference statements)

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“…Considering the results obtained in this study and other reports about different research studies carried out in the Brazilian states of Mato Grosso and Paraná with populations of weeds and different soybean cultivars (Pereira et al, 2015;Silva et al, 2015), this study allows to organize management planning for soybean crops based on sowing seasons and the emergence of weeds during the crop cycle (Table 2). Thus, for the first season the recommended chemical control would be performed with postemergence herbicide application with residual effect due to the critical period of interference being from 14 to 48 DAE.…”

Section: Resultsmentioning

confidence: 65%

“…The highest weed population at 14 DAE was also reported in soybeans crops in the Brazilian state of Paraná, but new emergence flows were not observed (Silva et al, 2015).…”

Section: Resultsmentioning

confidence: 84%

“…It was observed that SDM remained at low levels for the initial period and after 14 DAE showed large increase. Other authors reported that the accumulation of SDM remained at low levels up to 20 DAE but showed large increase after this period (Silva et al, 2009a(Silva et al, , 2015.…”

Section: Resultsmentioning

confidence: 88%

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Interference Periods in Soybean Crop as Affected by Emergence Times of Weeds

et al. 2018

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-Weeds emergence times modify competition with crops. Thus, the hypothesis was that the increase in weed emergence flow decreases the period prior to interference (PPI) in soybeans and increases the critical period of interference prevention (CPIP). The objective was to determine the PPI and the CPIP of weeds in soybean crops as affected by the preferred time of weeds emergence flow. Three experiments were conducted in the field in a randomized block design with four replications. The treatments were arranged in a factorial design with factor A consisting of coexistence or weed control in soybeans and factor B for eight periods (0, 7, 14, 21, 28, 35, 42 and 135 days after crop emergence (DAE)). The numbers of emerged plants and weed dry mass by genus and crop productivity were evaluated. The weed interference in culture during all the crop cycle reduces the soybean average yield 73, 94 and 89% in the first, second and third sowing times, respectively. Chemical control may be adopted at the end of PPI, which must be done at 14, 15 and 5 DAE crop, for the first, second, third times, respectively. The sowing in advance and intermediate time of recommendation increase the PPI in about 10 days, favoring the weed management in soybean crops. (0, 7, 14, 21, 28, 35, 42 Keywords: Glycine max, weed competition, crop yield losses. RESUMO -A época de emergência das plantas daninhas modifica a competição com as culturas. Assim, tem-se como hipótese que o aumento do fluxo de emergência de plantas daninhas diminui o período anterior à interferência (PAI) na soja, aumentando o período crítico de prevenção à interferência (PCPI). O objetivo foi determinar o PAI e o PCPI das plantas daninhas na cultura da soja, em função da época preferencial do fluxo de emergência de plantas daninhas. Realizaram-se três experimentos em campo, em delineamento experimental de blocos casualizados, com quatro repetições. Os tratamentos foram arranjados em esquema fatorial, sendo o fator A composto pela convivência ou controle de planta daninha na cultura da soja, e o fator B, por oito períodos

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Section: Resultsmentioning

confidence: 65%

“…The highest weed population at 14 DAE was also reported in soybeans crops in the Brazilian state of Paraná, but new emergence flows were not observed (Silva et al, 2015).…”

Section: Resultsmentioning

confidence: 84%

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Interference Periods in Soybean Crop as Affected by Emergence Times of Weeds

et al. 2018

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“…Studies that define the periods of interference are used to determine the best time to control weeds in the crop (Silva et al, 2015), and this time varies according to weed management, cultivar, species, and density. For the soybean cultivar 'P98Y12', the PPI was 7 DAE (Pereira et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Residual herbicides increase the period prior to interference in soybean cultivars

2020

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“…In general, there were no differences between the management periods for weeds dry matter due to the harvest of soybean varieties. Thus, only one mechanized hoe carried at 14 DAS would be enough to control the weeds in the crop critical period that ranges from 8 up to 38 days after the emergence [30][31][32][33].…”

Section: Resultsmentioning

confidence: 99%

Efficiency of the Adapted Automatic Row Hoe for Weed Control in Organic Soybean

Fey¹,

Costa²,

Ferreira³

et al. 2020

JEAI

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The objective of the present study was to evaluate the row hoe model CHOPSTAR®, the mechanical control of weeds in between the rows of soybean implanted in organic direct sowing system, associated with the camera-guided system. Two experiments were carried, being that in the first experiment an experimental design with sub-subdivided plots with four replicates. The plots corresponded to two soybean varieties ('Embrapa BRS 284' and 'Coodetec CD 216'), the subplots corresponded to the sowing densities of 329.2 and 574.6 thousand plants ha -1 ; and the subsubplots corresponded to four managements of weeds: one mechanized hoe (2 days after sowing -DAS), two mechanized hoes (22 and 47 DAS), one control manually hoed and other control without hoeing. In the second experiment a randomized block design in subdivided plots with three replicates was used. The plots corresponded to two soybean varieties ('BRS 284' and 'DF 2353'), Fey et al.; JEAI, 42(2): 25-36, 2020; Article no.JEAI.55215 26 the subplots constituted of different times when the hoes were made, being: one (14 DAS); two (7 and 21 DAS; two (14 and 28 DAS); three (7, 14 and 28 DAS); besides one control manually hoed up to 28 DAS. In the first experiment it was observed that the automatized hoe was efficient in controlling the weeds and it was necessary only one mechanized hoe (22 DAS) for the 'BRS 284' independent of the sowing density, while for the 'CD 216' the number of mechanized hoes depended on the sowing density. In the second experiment, it was necessary only one mechanized hoe (14 DAS) to avoid production losses in the varieties 'BRS 284' and 'DF 2353'. The automatized hoe is an alternative to control weeds in areas of organic soybean in direct sowing system, however, damages to the crop can occur depending on the sowing density, mainly in the late management of the mechanized hoe. Original Research Article

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

Cited by 6 publications

References 14 publications

Interference Periods in Soybean Crop as Affected by Emergence Times of Weeds

Interference Periods in Soybean Crop as Affected by Emergence Times of Weeds

Residual herbicides increase the period prior to interference in soybean cultivars

Efficiency of the Adapted Automatic Row Hoe for Weed Control in Organic Soybean

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