Manejo de plantas daninhas eudicotiledôneas na cultura da soja Roundup Ready

Rizzardi,; Silva, L.

doi:10.1590/s0100-83582014000400003

Cited by 6 publications

(5 citation statements)

References 14 publications

(10 reference statements)

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“…Arrow-leaf sida is considered strongly competitive with agricultural crops because it has a very deep root system and survives in inhospitable environments (Constantin et al, 2007), in addition to hindering mechanical harvesting in annual crops due to stem resistance. Due to the damages arrow-leaf sida causes to soybean, management practices are necessary by combining control actions in addition to identifying soybean cultivars that present better competitive ability in the presence of weeds (Rizzardi & Silva, 2014).…”

Section: Introductionmentioning

confidence: 99%

Competitive interaction between soybean cultivars and Sida rhombifolia

Konzen

Galon

Weirich

et al. 2021

Agraria

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The arrow-leaf sida (Sida rhombifolia), in addition to competing with soybeans, which causes productivity losses, is also host to the whitefly, which transmits viruses. The aim was to evaluate the competitive ability of soybean cultivars in the presence of an arrow-leaf sida biotype, with different proportions of plants in the association. The experiments were conducted in a completely randomized design, with four replications. Tested competitors included arrow-leaf sida with the four soybean cultivars in proportions crop:weed of 100:0; 75:25; 50:50; 25:75; and 0:100. Competitiveness analysis was carried out using diagrams applied to replacement series experiments in addition to the relative competitiveness indices. At 50 days after the emergence of the species, the variables height, diameter, leaf area, and dry mass of shoots were evaluated. Competition occurred between soybean cultivars in the presence of arrow-leaf sida, regardless of the plant proportion, causing reductions in all variables evaluated. Interspecific competition causes greater damage to al variables studied than intraspecific competition. There was competition for the same resources between soybean and arrow-leaf sida.

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Section: Introductionmentioning

confidence: 99%

Competitive interaction between soybean cultivars and Sida rhombifolia

Konzen

Galon

Weirich

et al. 2021

Agraria

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“…Resistance to ALS-inhibiting herbicides was found for chemical groups of imidazolinones, sulfonylureas and triazolopyrimidines (PRIGOL et al, 2014), as observed by this study. Unsatisfactory control of biotypes 20.2 and 21.1 by ALS-inhibiting herbicides, associated with low resistance to the herbicide glyphosate, may even hinder its management in soybean crops since their mutual and abusive use may submit wild poinsettia plants to high selection pressure (TREZZI et al, 2011;COSTA;RIZZARDI, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…Wild poinsettia (Euphorbia heterophylla L.) is a weed Euphorbiaceae which has been known as one of the most important infestant of soybean crops (TREZZI et al, 2006;SILVA, 2014). The species causes economic loss, since it features high ability to compete for resources in the environment and may decrease productivity, affect the quality of the product and hinder harvesting operations (CARVALHO et al, 2010, VARGAS et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

Low level resistance of wild poinsettia biotypes to glyphosate and alternative chemical control

et al. 2019

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In the State of Rio Grande do Sul (RS), Southern Brazil, glyphosate has not been capable of controlling wild poinsettia (Euphorbia heterophylla L.) in soybean fields, thus, suggesting resistance to this herbicide. Therefore, this study aimed at evaluating sensitivity of wild poinsettia biotypes to glyphosate, identifying the occurrence of resistance of wild poinsettia to the herbicide in RS state and determining the resistance factor of wild poinsettia biotypes under suspicion, besides assessing other herbicides as alternative controls. Two greenhouse experiments, which lasted two years, were conducted by a completely randomized design with four replications. Six biotypes (Factor A) and eight doses of glyphosate (Factor B) were used for getting the dose-response curve. Regarding the alternative control, post-emergence herbicides for soybean and corn crops were tested. Control and dry mass of the shoot were analyzed as variables. Resistance factors of resistant biotypes 20.2 and 21.1 were 4.83 and 5.29, respectively, by comparison with the susceptible biotype (11.4). In RS state, there has currently been high selection pressure due to the intensive use of glyphosate against wild poinsettia plants, as the result of the occurrence of biotypes 20.2 and 21.1 which have low levels of resistance to glyphosate and very little control by ALS-inhibiting herbicides. Therefore, an alternative to mitigate the problem is the use of herbicides with different mechanisms of action.

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“…P. ruderale and T. procumbens weeds were more numerous in the fallow area than in the treatments with cover crops (Table 3), which indicates that there is a greater proliferation of these species when there is no control by the cover crops phytomass. Rizzardi and Silva (2014) studied management strategies to prevent the emergence of weeds in soybean crop, and Martins et al (2016) in maize crop, reported that in fallow areas, managed with or without chemical control, contribute to the proliferation and a more difficult control of weeds. T. procumbens was found in fallow areas at all times, and in the evaluation at the time of desiccation for planting soybean, it was found in the area with P. glaucum.…”

Section: Resultsmentioning

confidence: 99%

Cover Crops in the Weed Management in Soybean Culture

et al. 2018

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The objective of this work was to evaluate the effect of cover crops on weed suppression in no-tillage soybean production systems in Rondonopolis, Mato Grosso. The experiment was carried out in an experimental area and consisted of the evaluation of nine cover treatments and soil management in a randomized complete block design. The treatments were: NT fallow, CT fallow, Crotalaria spectabilis, Crotalaria breviflora, maize + Crotalaria spectabilis, Pennisetum glaucum, Urochloa ruziziensis, Cajanus cajan, sunflower + Urochloa ruziziensis, Stylosanthes, Vigna unguiculata, Urochloa brizantha, maize + Urochloa ruziziensis. The evaluations were carried out before the desiccation for soybean sowing in the crops (10/23/2014) and (09/21/2015), before the post-emergence of soybean (09/12/2014) and (12/11/2015) and in the second season (12/06/2015). The useful area was 5 x 5 m and all weeds were counted and identified, but only the four species with the largest population were collected. The weeds evaluated were: Digitaria horizontalis, Digitaria insularis, Porophyllum ruderale and Tridax procumbens. Fallow treatments presented higher weed populations in relation to the others, in all periods of evaluation. Digitaria horizontalis presented the highest phytomass production in most seasons. The production systems with Urochloa ruziziensis, Pennisetum glaucum, Crotalaria spectabilis and intercropped with maize + Urochloa ruziziensis, sunflower + Urochloa ruziziensis and maize + Crotalaria spectabilis were the best alternatives for integrated weed management, reducing the incidence and increasing control of the main species that were detected during the conduction of the experiment.

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Manejo de plantas daninhas eudicotiledôneas na cultura da soja Roundup Ready

Cited by 6 publications

References 14 publications

Competitive interaction between soybean cultivars and Sida rhombifolia

Competitive interaction between soybean cultivars and Sida rhombifolia

Low level resistance of wild poinsettia biotypes to glyphosate and alternative chemical control

Cover Crops in the Weed Management in Soybean Culture

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