03944nab a2200301 i 4500003000900000005001700009008004100026040001800067072001400085100002400099100003200123100002000155100002800175100002400203100002500227245009500252500006700347520147000414520139301884650000903277650002503286650001703311650001803328650001303346650001903359773018503378856007903563BR-BrBNA20260205154647.0260205b2017    bl.qr|pooa||| 00| 0 por |  aBR-BrBNAbpor  aH60b0336  aForte, Cesar Tiago   aBasso, Felipe José Menin   aGalon, Leandro   aAgazzi, Luciane Renata   aNonemacher, Felipe   aConcenço, Germani   aHabilidade competitiva de cultivares de soja transgênica convivendo com plantas daninhas  a

Publicação online; 25 ref.; 3 tables; Summaries (En, Pt)  a


RESUMO  -   Objetivou-se com o trabalho determinar a habilidade competitiva de cultivares de soja na presença de picão-preto e leiteiro, em diferentes proporções de plantas na associação. O experimento foi conduzido em delineamento experimental de blocos casualizado, com quatro repetições. Os competidores testados incluíram o picão-preto e o leiteiro com cultivares de soja, nas proporções de 30:0; 20:10; 15:15; 10:20 e 0:30 plantas vaso-1 cultura: planta daninha. Aos 50 dias após a emergência da cultura e/ou das plantas daninhas foram avaliadas as variáveis área foliar (AF) e massa seca da parte aérea (MS). Ocorreu competição entre  as  cultivares  de  soja  na  presença  de  picão-preto  e/ou  leiteiro,  sendo  afetados  negativamente,  independentemente da proporção de plantas, provocando em todos os casos redução na AF e da MS das espécies. A soja apresentou maior competividade que o picão-preto e/ou o leiteiro. O leiteiro apresenta maior agressividade que o picão-preto ao ocasionar menor produção de AF e MS das cultivares de soja. A competição interespecífica causa maiores prejuízos a AF e a MS das espécies do que a intraespecífica. Ocorre basicamente a competição pelos mesmos recursos do meio entre a cultura da soja com as plantas daninhas picão-preto e o leiteiro.  


Palavras-chave:       Bidens pilosa; competição; Euphorbia heterophylla; Glycine max  a


ABSTRACT  -   The aim of this work was to determine the competitive ability of soybean cultivars in the presence of cobbler’s pegs and wild poinsettia in association in different plant proportions. The experiment was conducted in blocks randomized design, four replications. The weeds tested included cobbler’s pegs and the wild poinsettia with the soybean cultivars, the ratios of 30: 0; 20:10; 15:15; 10:20 and 00:30 pot-1 crop plants: weed. At 50 days after emergence of the crop and/or weed the plants variables: leaf area (LA) and dry weight of shoot (DM) were evaluated. There was competition between the soybean cultivars in the presence of cobbler’s pegs and/or wild poinsettia being adversely affected, irrespective of the proportion of plants, resulting in all cases reduction in LA and DM of the species. Soybean in general showed higher competitiveness than cobbler’s pegs and/or wild poinsettia. The wild poinsettia is more aggressive than the cobbler’s pegs causing lower production of LA and DM of the soybean cultivars. The interspecific competition caused a greater harm to LA and DM of the species than the intraspecific competition. Basically, is the competition for the same environment resources of the soybean crop with the weeds cobbler’s pegs and wild poinsettia.  


Key words:       Bidens pilosa; competition; Euphorbia heterophylla; Glycine max  aSOJA  aPLANTA TRANSGÊNICA  aERVA DANINHA  aPICÂO-PRETO  aLEITEIRO  aCOMPETIÇÃO0 04656dRecife-PE Universidade Federal Rural de Pernambuco 2006o2026-0515tRevista Brasileira de Ciências Agrárias (Brazil)x1981-1160gv. 12(2) p. 185-193; (2017)wBR2025005566  uhttp://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v12i2a5444/437