Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal

Elezović, I.; Datta, Avishek; Vrbničanin, Sava; Glamočlija, Đ.; Simić, Milena; Malidža, Goran; Knežević, Stevan Z.

doi:10.1016/j.fcr.2011.12.020

Cited by 37 publications

(35 citation statements)

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“…Os períodos de convivência não causaram efeito na quantidade de capítulos por área, mas os autores relataram redução significativa no número de aquênios por capítulo sob períodos crescentes de convivência com plantas daninhas em diferentes locais e épocas (Elezovic et al, 2012). No entanto, em seu estudo, verificaram redução na massa de mil aquênios, fato não observado neste trabalho.…”

Section: Resultsunclassified

“…Assim, vários estudos determinam o PCPI na cultura do girassol considerando como base um nível de 5% de perda aceitável na produtividade de aquênios (Alves et al, 2013;Brighenti et al, 2004;Elezovic et al, 2012;Silva et al, 2012).…”

Section: Resultsunclassified

“…Estudos relataram que o intervalo de tempo de permanência das plantas daninhas na cultura do girassol, sem aplicação de herbicida pré-emergente, variou de 14 a 26 dae, o que correspondeu à transição do estádio fenológico V3 (três folhas) para as fases de crescimento V4, com base no nível de 5% de perdas de produtividade aceitáveis (Elezovic et al, 2012).…”

Section: Introductionunclassified

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Períodos de interferência de plantas daninhas na cultura do girassol

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ResumoObjetivou-se neste trabalho determinar os períodos de interferência de plantas daninhas na cultura do girassol. Foram realizados dois experimentos com o girassol híbrido Helio 250, sendo um conduzido no verão e o outro, no inverno. Para ambos, o delineamento experimental utilizado foi em blocos casualizados, com quatro repetições, e cada unidade experimental foi constituída de cinco linhas de plantas com 6,0 m de comprimento, espaçadas por 0,7 m. No experimento de verão foram avaliados oito períodos de convivência e controle de plantas daninhas: 10, 20, 30, 40, 50, 60, 70 e 88 dias após a emergência (dae). No experimento de inverno, os períodos foram: 7, 14, 21, 28, 38, 48, 58 e 82 dae. Avaliaram-se a massa da matéria seca e a área foliar das plantas de girassol, produtividade, massa de mil aquênios e massa da matéria seca de plantas daninhas. Estimaram-se os períodos anteriores à interferência (PAI), períodos críticos de prevenção à interferência (PCPI) e períodos totais de prevenção à interferência (PTPI). Considerando-se a produtividade de aquênios no verão, o PAI foi de 16 dae da cultura, o PTPI, de 39 dae e o PCPI abrangeu 23 dias do ciclo da cultura. No inverno, o PAI foi de 12 dae, o PTPI estendeu-se até os 34 dae, resultando em um PCPI de 22 dias.Palavras-chave: Helianthus annuus L., competição, produtividade. Interference periods of weeds in sunflower crop AbstractThe objective of this work was to determine the periods of weed interference in sunflower crops. Two experiments were done with the sunflower hybrid Helio 250, one in the summer and the other in the winter. For both experiments, a randomized block design with four repetitions was used and each experimental unit was composed of plants in five lines, 6.0 m in length, spaced 0.7 m apart. In the summer experiment eight periods of cohabitation and weedy plant control were evaluated: 10, 20, 30, 40, 50, 60, 70 and 88 days after emergence (dae). In the winter experiment, the periods were 7, 14, 21, 28, 38, 48, 58 and 82 dae. The dry matter mass, leaf area of sunflower plants, yield, thousand achenes mass and weedy plant dry matter mass were evaluated. The periods prior to interference (PPI), the critical periods of preventing interference (CPPI), and the total periods of preventing interference (TPPI) were estimated. Considering the yield of achenes in the summer, the PPI was 16 dae of the crop, the CPPI was 39 dae and the TPPI lasted 23 days of the crop cycle. In winter, the PPI was 12 dae and the CPPI lasted for 34 dae, resulting in a TPPI of 22 days.Key words: Helianthus annuus L., competition, yield. INTRODUÇÃOO girassol (Helianthus annuus L.) é uma magnoliopsida (dicotiledônea) anual da família Asteraceae originária do continente norte-americano mas que é cultivada em todos os continentes, destaca-se mundialmente como importante cultura oleaginosa e apresenta ciclo curto e alta produção de óleo (Porto et al., 2007;Silva et al., 2007;Thomaz et al., 2012). Essa cultura tem crescimento inicial lento. A partir de 30 dias após a emergência, o c...

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Section: Resultsunclassified

Section: Introductionunclassified

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Períodos de interferência de plantas daninhas na cultura do girassol

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“…The use of growing degree days (GDD) accumulated from crop emergence or planting as the unit of time to quantify the duration of weed presence and the length of weed-free period (x-axis) is recommended (Elezovic et al 2012;Knezevic et al 2013). The use of GDD can also help determine the CPWC based on the respective crop-growth stage and the corresponding days after crop emergence for practical purposes because the rate of crop development is well correlated with thermal time.…”

Section: General Approach For the Suggested Statistical Analysismentioning

confidence: 99%

“…The following suggestions can be used as general guidelines for selecting the appropriate times for weed removal based on our experience and the summaries of previous studies (Elezovic et al 2012;Zimdahl 1980): (1) select two to three data points clustered around the early part of the crop-growing season (the first few weeks of the season) to best determine the suspected beginning of the CPWC, and (2) select two to three data points clustered around the later stages of crop growth (time of crop canopy closure) to best determine the end of the CPWC. One data point can be in the general area where the two curves are assumed to cross each other (Figure 1).…”

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The Critical Period for Weed Control: Revisiting Data Analysis

Knežević¹,

Datta

2015

Weed sci.

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There is an ever-larger need for designing an integrated weed management (IWM) program largely because of the increase in glyphosate-resistant weeds, not only in the United States but also worldwide. An IWM program involves a combination of various methods (cultural, mechanical, biological, genetic, and chemical) for effective and economical weed control (Swanton and Weise 1991). One of the first steps in designing an IWM program is to identify thecritical period for weed control(CPWC), defined as a period in the crop growth cycle during which weeds must be controlled to prevent crop yield losses (Zimdahl 1988).

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Residual herbicides affect critical time of Palmer amaranth removal in soybean

et al. 2021

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Glyphosate-resistant (GR) Palmer amaranth (Amaranthus palmeri S. Watson) is one of the most difficult to control weeds in soybean [Glycine max (L.) Merr.] production fields. Residual pre-emergence (PRE) herbicide applied at planting is one of the recommendations for management of herbicide-resistant Palmer amaranth; however, information is not available about the effect of residual herbicides on critical time of Palmer amaranth removal (CTPAR) to prevent an unacceptable yield loss in soybean. The objective of this study was to determine the CTPAR in soybean affected by residual PRE herbicides compared with the no PRE herbicide in southcentral Nebraska. Field experiments were conducted in 2018 and 2019 in a grower's field infested with GR Palmer amaranth near Carleton, NE. The treatments were arranged in a split-plot design with PRE herbicides (no PRE herbicide, flumioxazin, and a premix of flumioxazin/metribuzin/pyroxasulfone) as the main plot and Palmer amaranth removal timings as subplot treatments (a weed-free control; a nontreated control; and Palmer amaranth removal timing at the V1, V3, V6, R2, and R5 soybean growth stages). In the absence of a PRE herbicide, the CTPAR at 5% soybean yield loss occurred at V1 and V6 soybean growth stages, equivalent to 194 and 480 Celsius growing degrees days (GDDc) in 2018 and 2019, respectively. When flumioxazin was applied alone, the CTPAR was delayed until the V3 and V6 soybean growth stages, or 341 and 501 GDDc. When flumioxazin/metribuzin/pyroxasulfone premix was applied, the CTPAR was delayed until the V2 and R1 soybean growth stages, corresponding to

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Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal

Cited by 37 publications

References 26 publications

Períodos de interferência de plantas daninhas na cultura do girassol

Períodos de interferência de plantas daninhas na cultura do girassol

The Critical Period for Weed Control: Revisiting Data Analysis

Residual herbicides affect critical time of Palmer amaranth removal in soybean

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