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Relative Competitiveness of Common Bean Cultivars in Coexistence with Volunteer Corn Planta Daninha
AGUIAR,A.C.M.; BASSO,C.J.; SILVA,D.R.O.; GHELLER,D.P.; NOVELLO,B.D.; RIEDER,E..
ABSTRACT: This study evaluated the relative competitiveness of two common bean cultivars in coexistence with volunteer corn emerging at different times in different proportions of plants in the association. Firstly, for both beans and volunteer corn, the plant population was determined in which the final production of dry biomass becomes constant (24 plants pot-1). A completely randomized experiment design, with five replicates, was carried out in a 2×2×5 factorial scheme, involving two common bean cultivars (IPR Gralha and Fepagro Triunfo), two emergence times of volunteer corn plants (-7 and 0 days in relation to beans) and five proportions of plants in the association (100:0, 75:25, 50:50, 25:75 and 0:100). At 35 days after bean emergence, measurements...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris; Zea mays; Volunteer plants; Competition; Emergence periods; Replacement series.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100294
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Interference and Economic Threshold Level of Volunteer Corn in Soybean Planta Daninha
AGUIAR,A.C.M.; BASSO,C.J.; MURARO,D.S.; PANSERA,E.; SILVA,D.R.O..
ABSTRACT: Volunteer corn is considered a weed when its emergence occurs during the crop cycle in succession, as is the case of volunteer corn plants of hybrids of Roundup Ready (RR) in crops implanted with RR soybean cultivars. The objective of this study was to verify the effect of the interference of different RR plant densities on the RR soybean crop, as well as to estimate the level of economic damage (NDE). For this, a field experiment was carried out at two sites in a factorial scheme with four replications, the treatments consisted of densities of volunteer corn RR (0; 1; 2; 3; 4; 5; 6; 7 and 8 plants m-2) competing in the entire soybean cycle. The changes in morphology and yield components behaved directly proportional to the increment of volunteer...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Level of economic damage; Volunteer corn density; Yield loss.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100333
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Leaf Consumption and Preference to Conyza sp., Conventional and Bt Soybean by Helicoverpa armigera Planta Daninha
CUTTI,L.; MURARO,D.S.; SILVA,V.A.; KASPARY,T.E.; BASSO,C.J.; ROGGIA,S..
ABSTRACT: Helicoverpa armigera caterpillars are polyphagous and exhibit high migratory potential. Given the traits of this pest, alternative hosts located in or near the crop stand may support the survival and permanence of H. armigera in the field. The aim of this study was to investigate Conyza sp. as a food source for H. armigera caterpillars in scenarios with conventional and Bt soybean. Two experiments were conducted in biochemical oxygen demand incubators. The first assessed consumption of conventional soybean, Bt soybean and Conyza sp. leaves by 3rd and 5th instar caterpillars, with no choice given (no-choice test). The second test evaluated the food preference of 3rd instar H. armigera larvae, with two choices given (dual-choice test). Fifth instar...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Weed; Glycine max; Alternative host..
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100181
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Interference of Brassicaceae and Poaceae on Canola Hybrids Planta Daninha
SILVA,D.R.O.; AGUIAR,A.C.M.; GHELLER,D.P.; NOVELLO,B.D.; BASSO,C.J..
ABSTRACT: The objective of this study was to evaluate the initial competitive ability of canola hybrids against Brassicaceae and Poaceae species in terms of root and shoot resources. Two experiments were conducted in greenhouse, in a completely randomized design with four replications. The treatments consisted of interference conditions by root + shoot interference (root+shoot) and shoot interference (Light); and Brassicaceae and Poaceae weeds competing with hybrid of canola (Hyola 61 and Diamond) with different traits for competitiveness. The plant height, root length, dry matter of shoot and root, number of leaves and leaf area were evaluated. Data were compared using orthogonal contrasts. The turnip and volunteer canola reduced root development of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Root interaction; Raphanus sativus; Avena strigosa; Lolium multiflorum; Brassica napus; Light.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100282
Registros recuperados: 4
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