Determination of the critical period of weed control in corn using a thermal basis

Bedmar, Francisco; Manetti, Pablo Luis; Monterubbianesi, Gloria

doi:10.1590/s0100-204x1999000200006

Cited by 36 publications

(39 citation statements)

References 13 publications

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“…On the other hand, at 75 DAT Pretilachlor fb with one hand weeding reduced the highest percentage of weed density and biomass, and Pretilachlor fb 2,4-D dimethyl amine and Pendimethalin fb 2,4-D dimethyl amine reduced the lowest weed density and biomass, respectively (Table 4).Weed density and biomass at earlier stage of crop growth are more critical than later stage. Several researchers (Kropff et al, 1993;Frantik, 1994;Bedmar et al, 1999) established the importance of time of emergence of the weeds. Generally, weeds that emerge simultaneously with the crop or shortly after the crop cause severe yields losses at very low densities.…”

Section: Percent Reduction In Weed Density and Biomassmentioning

confidence: 99%

Integration of chemical and manual control methods for sustainable weed management in inbred and hybrid rice

Popy

Islam

Hasan

et al. 2017

J Bangladesh Agric Univ

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Herbicidal weed control is gaining popularity in the developing countries but its efficacy still remains unclear. Therefore, an experiment was conducted to find out appropriate weed management practices for inbred and hybrid rice. The experiment comprised of inbred and hybrid varieties (two of each), and eight weed control treatments arranged in randomized complete block design with three replicates. Hybrid varieties performed better in terms of yield attributes and yield than inbred varieties. The highest grain yield (5.3 t ha −1 ) was obtained from the hybrid Agrodhan-12 and the lowest one (4.3 t ha −1 ) was from inbred Binadhan-7. Weed free treatment resulted in the highest grain yield (6.1 t ha −1 ) and the lowest one was with weedy treatment (1.96 t ha −1 ). The highest grain yield was obtained from Agrodhan-12 in weed free condition (6.9 t ha -1 ), while the lowest value was in inbred BRRI dhan49 under weedy condition (1.73 t ha −1 ). Weed-free treatment and the treatments of Pretilachlor fb Penoxsolum, Pretilachlor fb hand weeding, and Pendimethalin fb hand weeding showed similar performances in reducing weed density and eventually resulted in similar and the highest grain yield. Based on these results it may conclude that Pretilachlor applied at 2 days after transplanting (DAT) fb Penoxsolum at 21 DAT is the best weed management option. But from sustainability viewpoint, Pretilachlor or Pendimethalin applied at 2 DAT along with one hand weeding at 35 DAT may be recommended for effective weed management in inbred and hybrid rice during monsoon season.

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Section: Percent Reduction In Weed Density and Biomassmentioning

confidence: 99%

Integration of chemical and manual control methods for sustainable weed management in inbred and hybrid rice

Popy

Islam

Hasan

et al. 2017

J Bangladesh Agric Univ

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“…Na avaliação de pré-colheita, os herbicidas aplicados no início do desenvolvimento da cultura apresentaram controle inferior de BRAPL em relação aos demais tratamentos (Tabela 1). Esta situação se deveu à emergência de novas plantas de BRAPL, o que se torna possível após a diminuição do efeito residual do herbicida (Bedmar et al, 1999). Entretanto, a emergência de plantas daninhas além do período crítico de competição não limita o crescimento da cultura (Singh et al, 1996); assim, o efeito satisfatório dos herbicidas no início do desenvolvimento das plantas é suficiente para que a cultura não tenha o rendimento de grãos afetado pelas plantas daninhas.…”

Section: Resultsunclassified

“…Estes efeitos acontecem devido às variações na qualidade da luz, que é alterada pelas folhas do dossel, e pode servir como um importante sinal entre as plantas da comunidade (Schimitt & Wulff, 1993). Dessa forma, a eliminação de plantas daninhas desde a emergência da cultura é importante para a diminuição dos seus efeitos sobre o rendimento de grãos da cultura (Bedmar et al, 1999). A tradicional indicação de que os efeitos das plantas daninhas somente passam a acontecer algumas semanas após a emergência da cultura pode não ser válida para todas as situações (Holt, 1995), principalmente em altos níveis de exploração do ambiente e rendimento de grãos.…”

Section: Resultsunclassified

Redução da interferência de Brachiaria plantaginea (link) hitch. em milho através de capinas e aplicação de herbicidas em diferentes épocas

et al. 2000

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RESUMO -O rendimento de grãos de milho é afetado pela interferência com as plantas daninhas, que pode variar em função da eficiência e da época de realização do método de controle utilizado no manejo da cultura. O objetivo deste trabalho foi determinar os efeitos da aplicação de herbicidas e de capinas em diferentes épocas sobre o controle de plantas daninhas e o rendimento de grãos na cultura do milho. O experimento foi instalado no sistema convencional de preparo do solo em Eldorado do Sul (RS), no ano agrícola 1997/98. A espécie de planta daninha predominante na área experimental foi Brachiaria plantaginea (BRAPL), em infestação média de 285 plantas por m 2 . Os tratamentos foram constituídos pela aplicação isolada, seqüencial ou em mistura em tanque, em diferentes doses e épocas, dos herbicidas atrazine, atrazine + óleo vegetal, metolachlor e nicosulfuron. Todos os tratamentos com herbicidas foram correspondidos por tratamentos em que se utilizou capina manual com início na mesma época de aplicação dos herbicidas. O controle realizado em pré-emergência ou no início do desenvolvimento da cultura proporcionou maior rendimento de grãos, mesmo com a diminuição do controle de BRAPL no final do ciclo. As aplicações seqüenciais de herbicidas proporcionaram maior rendimento de grãos do que as misturas em tanque. Os rendimentos de grãos obtidos com a aplicação de herbicidas nas diversas épocas não foram diferentes em relação às suas respectivas capinas.Palavras-chave: controle, plantas daninhas, herbicidas, misturas. Sul-RS, Brazil, during ABSTRACT -Weed competition affects corn grain yield and varies depending on the efficiency and timing of weed control. The objective of this research was to determine the effect of using herbicides and hoeing at different times on weed control and corn grain yield. The experiment was conducted under a conventional tillage cropping system in Eldorado do

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“…In accumulated thermal units (ATU), it represents 222 to 416 ATU or approximately 15 to 30 DAE (Bedmar et al, 1999). Following this idea, it is noticed that at 14 DAA, the phytotoxicity levels ranged from 20 to 90% for the lowest and highest rate of Zapp Qi ® and Gramocil ® , respectively.…”

Section: Treatmentsmentioning

confidence: 98%

White clover tolerance to herbicides applied at different rates and phenological stages

Adami¹,

Modolo²,

Adami³

et al. 2017

Afr. J. Agric. Res.

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Glyphosate, 2,4-D, imazethapyr and paraquat + diuron were studied in greenhouse experiments at four application rates in order to evaluate their effects on white clover (Trifolium repens L.) growth and aerial shoot injury at three different phenological stages. Herbicide-induced foliar injury on white clover ranged from no symptoms to early chlorosis, leaf necrosis, stunted growth and death depending on herbicide rate and white clover phenological stage. Imazethapyr showed the highest selectivity at the three-leaf trifoliate stage. Seedlings treated with glyphosate at 1080 g a.i. ha -1 , however, were dead at 21 days after application (DAA). White clover herbicide tolerance increased with plant age, and selectivity was found to be affected as herbicide rate increased. Paraquat + diuron caused the highest levels of white clover phytotoxicity and plant death. The herbicides studied showed potential to be used as selective products on white clover depending on their rates, as well as the timing of their application onto white clover depending furthermore, on the specificity weeds infesting white clover fields.

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Determination of the critical period of weed control in corn using a thermal basis

Cited by 36 publications

References 13 publications

Integration of chemical and manual control methods for sustainable weed management in inbred and hybrid rice

Integration of chemical and manual control methods for sustainable weed management in inbred and hybrid rice

Redução da interferência de Brachiaria plantaginea (link) hitch. em milho através de capinas e aplicação de herbicidas em diferentes épocas

White clover tolerance to herbicides applied at different rates and phenological stages

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