03380nab a2200265 i 4500003000900000005001700009008004100026040001800067072001400085100001700099100001800116100001800134100001500152100002400167100001800191245007100209500006600280520111100346520132001457650002202777650003102799650001702830773019002847856007703037BR-BrBNA20230920100904.0230703b2019    bl.ar|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aH60b1440  aCastro, T.S.  aRocha, P.R.R.  aBarreto, G.F.  aMaia, S.S.  aAlbuquerque, J.A.A.  aAlves, J.M.A.  aWeed interference in semi-erect and semi-prostate cowpea cultivars  aPublicação on-line; 21 ref.; 6 illus.; Summaries (En, Pt)  a

ABSTRACT - This study aimed to determine weed interference periods in semi-erect
and semi-prostrate cowpea cultivars. Two simultaneous experiments were conducted
with the cowpea cultivars BRS Guariba (semi-erect) and BRS Aracê (semi-prostrate).
The experimental design was a randomized block design with four replications in a
7 × 2 factorial scheme, seven periods × two weed management (control and
coexistence). Control and coexistence periods consisted of 0, 0-8, 0-16, 0-24, 0-32, 0-
45, and 0-60 days after emergence (DAE) for the semi-erect cultivar and 0, 0-8, 0-16,
0-24, 0-32, 0-45, and 0-64 DAE for the semi-prostrate cultivar. Competition throughout
the cycle reduced productivity by up to 39.81% for BRS Guariba and 37.27% for BRS
Aracê. The cultivars BRS Guariba and BRS Aracê presented critical period of
interference prevention of 9 to 41 DAE and 15 to 32 DAE, respectively. The semiprostrate 
cultivar BRS Aracê was more competitive with weeds, requiring a shorter
control period to express maximum productivity.

Keywords: Vigna unguiculata, competition, interference periods.
  a

RESUMO - Objetivou-se com este trabalho determinar os períodos de interferência
de plantas daninhas em cultivares de feijão-caupi de porte semiereto e
semiprostrado. Foram conduzidos dois experimentos simultâneos com os cultivares
BRS Guariba (semiereto) e BRS Aracê (semiprostrado). Para ambos os
experimentos, o delineamento experimental foi em blocos casualizados com quatro
repetições, em esquema fatorial 7 × 2, sete períodos × duas formas de manejo das
plantas daninhas (controle e convivência). Os períodos de controle e convivência
consistiram em 0, 0-8, 0-16, 0-24, 0-32, 0-45 e 0-60 dias após a emergência (DAE)
para o cultivar de porte semiereto e 0, 0-8, 0-16, 0-24, 0-32, 0-45 e 0-64 DAE para
o cultivar de porte semiprostrado. A competição durante todo o ciclo reduziu a
produtividade em até 39,81% para o cv. BRS Guariba e 37,27% para o cv. BRS
Aracê. Os cultivares BRS Guariba e BRS Aracê apresentaram período crítico de
prevenção à interferência de 9 a 41 DAE e 15 a 32 DAE, respectivamente. O cv.
BRS Aracê de porte semiprostrado foi mais competitivo com as plantas daninhas,
necessitando de menor período de controle para expressar a máxima produtividade.

Palavras-chave: Vigna unguiculata, competição, períodos de interferência.  aVIGNA UNGUICULATA  aCOMPETIÇÃO BIOLÓGICA  aERVA DANINHA0 0886dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978o2023-031023tPlanta Daninha (Brazil)x0100-8358; 1806-9681 (on-line)gv. 37 p. 1-9; (2019)wBR2023000477  uhttps://www.scielo.br/j/pd/a/h9mn7VkprHZ3Z7vCSFzfYFJ/?format=pdf&lang=en