Yield loss prediction for integrated weed management in direct-seeded rice
The critical period of rice-weed competition was studied for the rice varieties Oryzica 1 and CICA 8, in 1989 and 1990. Weed species were: Eleusine indica, Echinochloa crus-galli, Echinochloa colonum, Cyperus difformis, Cyperus esculentus, Cyperus iria, Leptochloa filiformis, and Eclipta alba. Compe...
| Autores principales: | , , , |
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| Formato: | Informe técnico |
| Lenguaje: | Inglés |
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International Center for Tropical Agriculture
1992
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/72372 |
| _version_ | 1855538803864764416 |
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| author | Fischer, Albert J. Lozano, J.C. Ramírez Suárez, A. Sanint, Luis Roberto |
| author_browse | Fischer, Albert J. Lozano, J.C. Ramírez Suárez, A. Sanint, Luis Roberto |
| author_facet | Fischer, Albert J. Lozano, J.C. Ramírez Suárez, A. Sanint, Luis Roberto |
| author_sort | Fischer, Albert J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The critical period of rice-weed competition was studied for the rice varieties Oryzica 1 and CICA 8, in 1989 and 1990. Weed species were: Eleusine indica, Echinochloa crus-galli, Echinochloa colonum, Cyperus difformis, Cyperus esculentus, Cyperus iria, Leptochloa filiformis, and Eclipta alba. Competition effects were similar for both varieties. Weeds emerging with the crop were the most damaging ones. Rice yields increased with longer weed-free periods up to 70 days after emergence (d.a.e.). No further yield increases resulted from longer weed-free durations. Weed emergence and growth after 70 d.a.e. was suppressed by the crop. Both rice cultivars required a critical height of 44 to 50 cm. to suppress weed growth 70 d.a.e. Though both varieties were equally weed suppressive by 70 d.a.e., leaf area index of CICA 8 was much larger than, that of Oryzica 1 when rice grew weed-free after emergence. Economic analysis showed that under heavy weed infestations, in a system where rice cannot be early and continuously flooded, three postemergent herbicide applications at 9, 18 and 44 d.a.e were justified. |
| format | Informe técnico |
| id | CGSpace72372 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1992 |
| publishDateRange | 1992 |
| publishDateSort | 1992 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace723722025-11-05T18:17:00Z Yield loss prediction for integrated weed management in direct-seeded rice Fischer, Albert J. Lozano, J.C. Ramírez Suárez, A. Sanint, Luis Roberto oryza sativa rice varieties weeds weed control integrated control economic analysis biological competition crop losses arroz variedades malezas control de malezas control integrado análisis económico competencia biológica pérdidas de la cosecha The critical period of rice-weed competition was studied for the rice varieties Oryzica 1 and CICA 8, in 1989 and 1990. Weed species were: Eleusine indica, Echinochloa crus-galli, Echinochloa colonum, Cyperus difformis, Cyperus esculentus, Cyperus iria, Leptochloa filiformis, and Eclipta alba. Competition effects were similar for both varieties. Weeds emerging with the crop were the most damaging ones. Rice yields increased with longer weed-free periods up to 70 days after emergence (d.a.e.). No further yield increases resulted from longer weed-free durations. Weed emergence and growth after 70 d.a.e. was suppressed by the crop. Both rice cultivars required a critical height of 44 to 50 cm. to suppress weed growth 70 d.a.e. Though both varieties were equally weed suppressive by 70 d.a.e., leaf area index of CICA 8 was much larger than, that of Oryzica 1 when rice grew weed-free after emergence. Economic analysis showed that under heavy weed infestations, in a system where rice cannot be early and continuously flooded, three postemergent herbicide applications at 9, 18 and 44 d.a.e were justified. 1992 2016-02-29T17:15:58Z 2016-02-29T17:15:58Z Report https://hdl.handle.net/10568/72372 en Open Access application/pdf International Center for Tropical Agriculture Fischer, Albert J.; Lozano T., José Carlos; Ramírez Suárez, Alvaro; Sanint, Luis Roberto. 1992. Yield loss prediction for integrated weed management in direct-seeded rice. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. 24 p. |
| spellingShingle | oryza sativa rice varieties weeds weed control integrated control economic analysis biological competition crop losses arroz variedades malezas control de malezas control integrado análisis económico competencia biológica pérdidas de la cosecha Fischer, Albert J. Lozano, J.C. Ramírez Suárez, A. Sanint, Luis Roberto Yield loss prediction for integrated weed management in direct-seeded rice |
| title | Yield loss prediction for integrated weed management in direct-seeded rice |
| title_full | Yield loss prediction for integrated weed management in direct-seeded rice |
| title_fullStr | Yield loss prediction for integrated weed management in direct-seeded rice |
| title_full_unstemmed | Yield loss prediction for integrated weed management in direct-seeded rice |
| title_short | Yield loss prediction for integrated weed management in direct-seeded rice |
| title_sort | yield loss prediction for integrated weed management in direct seeded rice |
| topic | oryza sativa rice varieties weeds weed control integrated control economic analysis biological competition crop losses arroz variedades malezas control de malezas control integrado análisis económico competencia biológica pérdidas de la cosecha |
| url | https://hdl.handle.net/10568/72372 |
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