Weed Interference Periods in Early Wheat in the Midwest of Paraná

Silva, A.A.P.; Neto, Antônio Mendes Oliveira; Naiara, G.; Karpinski, Ricardo André Kloster; Maciel, Cleber Daniel de Góes

doi:10.1590/s0100-83582016340200010

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…The critical period for preventing weed interference in wheat is at the beginning of its growing cycle. At this stage, weeds enhance their biomass due to favorable environmental conditions (Silva et al, 2016). If weeds such as Canada thistle are controlled at the early growth stages, the effectiveness of the chemical treatment may be improved.…”

Section: Resultsmentioning

confidence: 99%

Postemergence Herbicide Applications Impact Canada Thistle Control and Spring Wheat Yields

Zargar¹,

Bayat²,

Lyashko³

et al. 2019

Agronomy Journal

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Canada thistle (Cirsium arvense L.) growing in spring wheat (Triticum aestivum) is difficult to control for several reasons. First, it is a perennial weed that has an extensive root system. Second, the cash‐crop wheat prevents the use of many chemicals, and third, Canada thistle is becoming resistant to many single action herbicides. The objective of this study was to evaluate the effect of postemergence herbicide applications on Canada thistle control growing in a spring wheat field. Replicated studies conducted in Russia between 2015 and 2017 evaluated the impact of different herbicide mixtures on Canada thistle control. The formulated mixtures of (iodosulfuron/mesosulfuron/antidote mefenpyr‐diethyl) mixed with triasulfuron and metsulfuron and triasulfuron + metsulfuron increased wheat yields 48 to 60% and provided the greatest (>85%) Canada thistle suppression in all experiments. Generally, (aminopyralid/florasulam), triasulfuron and (2,4‐D/florasulam) provided little control. It can be concluded that in all treatments, the herbicide mixtures did not provide 100% control, and therefore care must be used to prevent the creation of herbicide resistant Canada thistle. Core Ideas Formulated mixtures of herbicides containing (iodosulfuron/mesosulfuron/antidote mefenpyr‐diethyl) and triasulfuron plus metsulfuron provided the most effective Canada thistle suppression. Canada thistle was better controlled at the early stage of spring wheat. Herbicide mixtures containing multiple modes of action was more effective than a single mode of action herbicide in the control of Canada thistle in wheat.

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Section: Resultsmentioning

confidence: 99%

Postemergence Herbicide Applications Impact Canada Thistle Control and Spring Wheat Yields

Zargar¹,

Bayat²,

Lyashko³

et al. 2019

Agronomy Journal

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“…PBI was estimated considering a 5% reduction in crop maximum productivity in each of the management, being defined as the average cost to control the weed community present (Silva et al, 2015;Silva et al, 2016;Agostinetto et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Weed interference capacity on soybean yield

Rüdell

Petrolli

Santos

et al. 2021

Rev. Fac. Nac. Agron. Medellín

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Among biological factors, weeds are the most important limiting factor for crop yields, as well as increasing production costs. The aim was to determine the influence of control and coexistence of weed community on soybean crop yield and to define the period before interference, the critical period of interference prevention and the total period of interference prevention, with the comparative use of chemical and mechanical methods for weed eradication. The study was conducted in an experimental field in the 2018/2019 harvest. A randomized block with four replications was implemented as experimental design, using two methods for control. The evaluated periods were 0-10, 0-20, 0-30, 0-40, 0-50, 0-60 and 130 days after crop emergence. It was possible to observe that the use of the chemical method generated a higher yield compared to mechanical method. The period before the interference in both chemical and mechanical management was similar, approaching 20 days after crop emergence. The critical period of interference prevention was between 20-50 and 40.5 days after crop emergence in chemical and mechanical methods, respectively. The total period of interference prevention was extended to 50 and 40.5 days after crop emergence in chemical and mechanical methods, respectively. The reduction in productivity due to weed interference was 1639 kg ha-1 (55%)and 947 kg ha-1 (34.6%) in chemical and mechanical methods, respectively.

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“…However, the critical period of weedcompetition was determined to be between 30 and 50 days after sowing of wheat. In a more recent study, Silva et al [34] found that the number of reproductive tillers per plant and spikelets per spike, spike length, plant height and wheat crop yield were significantly affected by coexistence with prevailing infestation of wild radish (Raphanus raphanistrum L.), and the critical period of interference was determined at 16 to 24 days after crop emergence.…”

Section: Introductionmentioning

confidence: 99%

Competition of Weeds Dominated by Wild Oat (Avena sterilis L.) in Wheat (Triticum durum Desf.) in Jordan

Qasem

2021

Agronomy

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Wheat is the main field crop grown in Jordan. Productivity is low due to different factors, including erratic rainfall, poor soil fertility and weed competition. A field experiment was carried out at the University of Jordan Research Station for two growing seasons to determine the effect of weed competition on growth and yield of wheat (Triticum durum Cv. “Hourani”). Treatments consisted of either allowing weeds to infest the crop or maintaining the crop weed-free for increasing durations after emergence. Results showed that, the longer the periods of weed competition, the greater the loss in crop growth and yield. Average reductions in grain and straw yields were 41% and 37%, respectively. The highest grain yield obtained was from weed-free, and the lowest was in weed-infested plots for the entire growing season. Average grain yield was not significantly different at 14 to 49 days of weed-infested periods, while none of the weed-free periods produced a yield similar to that of the weed-free control. However, maintaining a weed-free crop for three weeks after emergence significantly increased grain yield compared with the weed-infested control. High rainfall in the first season almost doubled weed growth and greatly reduced wheat growth and yield compared with the second season. To determine the critical period of weed competition and the influence of weed infestation on wheat grain yield, Gompertz and logistic equations were fitted to data representing increasing duration of weed-free and weed-infested periods, respectively. Based upon an arbitrary 5% level of average grain yield loss in the two years, the critical period of weed competition occurred at 0–49 days after wheat emergence, which corresponded with the rapid increase in weed biomass.

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Weed Interference Periods in Early Wheat in the Midwest of Paraná

Cited by 3 publications

References 11 publications

Postemergence Herbicide Applications Impact Canada Thistle Control and Spring Wheat Yields

Postemergence Herbicide Applications Impact Canada Thistle Control and Spring Wheat Yields

Weed interference capacity on soybean yield

Competition of Weeds Dominated by Wild Oat (Avena sterilis L.) in Wheat (Triticum durum Desf.) in Jordan

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