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| Format: | Artículo científico |
| Sprache: | en |
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Universidade Estadual de Maringá
2010
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=303026594025 |
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- The effects of the coexistence of weed communities on table beet yield during early crop development Leonardo Bianco Carvalho Caio Dória Guzzo Robinson Antonio Pitelli Arthur Bernardes Cecílio Filho Silvano Bianco Agrociencias weeds interference Beta vulgaris direct seeding seedling transplanting The objective was to evaluate the effects of initial weedy periods on the weed community and on the productivity of direct seeded and transplanted table beet cropping systems. A field trial was conducted at São Paulo State University, Brazil, in a randomized complete block design using a 2 x 13 factorial scheme. Direct seeding and seedling transplanting methods were evaluated within thirteen increasing weekly weedy periods. Weed relative importance was calculated and weed density and weed dry matter accumulation data were analyzed by nonlinear regression as well as beet yield and stand, which were submitted to analysis of variance. Amaranthus viridis, Coronopus didymus, Cyperus rotundus, Digitaria nuda, Galinsoga parviflora and Nicandra physaloides were the most important weeds found, with special reference to C. didymus. Weed dry matter accumulation was greater in the direct seeded crop, although weed density was higher in the transplanted crop. Transplanted beet yield was greater than of direct seeded beet in the weed-free treatment during the whole crop cycle. Crop-weed coexistence could remain for four and seven weeks after seeding/transplanting in direct seeded and in transplanted beet, respectively, before reducing yield economically. Thus, direct seeded crop was more susceptible to weed interference than the transplanted one. 2010 artículo científico 1679-9275 https://www.redalyc.org/articulo.oa?id=303026594025 en http://www.redalyc.org/revista.oa?id=3030 Acta Scientiarum. Agronomy application/pdf Universidade Estadual de Maringá Acta Scientiarum. Agronomy (Brasil) Num.4 Vol.32