INTERFERENCE PERIODS AMONG WEEDS AND SOYBEAN RR TM CROPS IN THE WESTERN CENTER AREA OF THE BRAZILIAN STATE OF PARANÁ

Planta Daninha

OLIVEIRA NETO, A.M.¹  MACIEL, C.D.G.¹  GUERRA, N.¹  Universidade Estadual do Centro-Oeste, Guarapuava, Brazil¹  Universidade Federal de Pelotas, Pelotas, Brazil¹  Universidade Federal de Santa Catarina, Curitibanos, Brazil¹  SILVA, A.A.P.¹  HELVIG, E.O.¹ 

关键词: words: coexistence;    weed control;    competition;    Glycine max;   

DOI  :  10.1590/S0100-83582015000400009

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

One of the factors that can influence soybeans yield is the interference imposed by weeds. This research has aimed to determine the critical period of weed interference on cv. INT 6100 RRTM soybeans. The experiment was conducted under field conditions at Campo Mourão County, Parana State, in the 2013/2014 harvest, using randomized blocks, arranged in a 2 x 8 factorial, with four replications. In the first factor, the coexistence (period before weed interference) and control (total period of weed interference prevention) periods were assessed. The second factor consisted of management times of weed species (0, 7, 14, 28, 35, 49, 56 and 130 days after emergence - DAE). The evaluations performed were density and shoot dry matter of the weed community, height, number of pods, thousand grain weight and soybean yield. Among the weed species in soybean crops, there was predominance of eudicotyledonous ones (82%). The yield results allowed establishing, for cv. INT 6100 RRTM soybeans at Campo Mourão County, Parana State, a critical period for preventing interference between 24-38 DAE.

【 授权许可】

Unknown