Time of emergency of ryegrass and wild radish on the competitive ability of barley crop

Ciência Rural

Silva, Antonio Alberto da¹  Forte, Cesar Tiago⁶  Tironi, Siumar Pedro⁷  Radünz, André Luiz⁶  Faria, Autieres Teixeira¹  Silva, Alexandre Ferreira da⁴  Fialho, Cíntia Maria Teixeira⁵  Rocha, Paulo Roberto Ribeiro²  Aspiazú, Ignacio³  Galon, Leandro⁶ 

[1]Universidade Federal de Viçosa, Viçosa, Brazil

[2]Universidade Federal de Roraima, Boa Vista, Brazil

[3]Universidade Estadual de Montes Claros, Janaúba, Brazil

[4]Embrapa Milho e Sorgo, Sete Lagoas, Brazil

[5]Universidade Federal Rural do Semi-Árido, Mossoró, Brazil

[6]UFFS, Erechim, Brazil

[7]Universidade Federal da Fronteira Sul, Chapecó, Brazil

关键词: Hordeum vulgare;    Lolium multiflorum;    Raphanus raphanistrum;   

DOI  :  10.1590/0103-8478cr20131633

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

The objective was to evaluate the effects of times of emergence of the weed ryegrass species and wild radish on barley. The experiment was conducted in a randomized block design, arranged in a 2x5 factorial design, with three replicates. In factor A were allocated the competing species (ryegrass and wild radish) and in factor B the emergence periods (14 and 7 days before, on the same day, 7 and 14 days after crop emergence). At the beginning of barley flowering, the following variables were quantified: plant height, number of stalks or stems, leaf area, and shoot dry mass of crop and weeds. All barley variables had increased in value with the delay in weed emergence. The species, cultivated or weeds, that emerged earlier showed greater competitive ability, dominating the environment when emerging 14 days before each other. The later the emergence of weeds with respect to the crop, the less the interference they cause, and, thereby, the crop presents a greater ability to compete with the weeds for available resources in the environment.

【 授权许可】

Unknown