Mixed weed infestations : prediction of crop losses for economic weed management in rice

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cg.coverage.countryColombia
cg.coverage.iso3166-alpha2CO
cg.coverage.regionLatin America
cg.coverage.regionSouth America
cg.subject.ciatRICEen
cg.subject.ciatFARMING SYSTEMSen
dc.contributor.authorFischer, Albert J.en
dc.contributor.authorRamírez Suárez, A.en
dc.date.accessioned2016-02-29T17:10:47Zen
dc.date.available2016-02-29T17:10:47Zen
dc.identifier.urihttps://hdl.handle.net/10568/71416
dc.titleMixed weed infestations : prediction of crop losses for economic weed management in riceen
dcterms.abstractWeed control in Latin America is costly and heavily dependent upon herbicides. Often irrigated rice farmers spray herbicides in late post-emergence at 30 to 44 days after emergence (d.a.e.). The economic benefits from such late applications are often unclear. Two experimental approaches involving density series of Eclipta alba, Leptochloa filiformis, Eleusine indica, a 1:1 mixture of Echinochloa colona and E. crusgalli, and a range of rice densities were used to estimate crop losses for late weed infestations, and the benefit of increasing rice densities to reduce weed competition. The experiments were conducted in Colombia, and current values of rice and farming inputs were used for economic analysis. With farmers obtaining average yields (5600 kg/ha) only weed densities larger than about 20 plants/m2 would justify herbicide applications after 30 d.a.e. Opportunities to reduce herbicide use are even greater in low-yielding farms (3500 kg/ha), where herbicides would pay off only at weed densities larger than about 30 plants/m2. Handweeding could be an alternative to herbicide use at weed densities higher than about 25 plants/m2. Using high rice densities, providing large numbers of tillers/m2, was economical even at large weed infestations (> 100 plants/m2). Omitting the late post-emergence herbicide application would reduce weed control costs in Colombia by 28 percent.en
dcterms.accessRightsOpen Access
dcterms.bibliographicCitationFischer, Albert J.; Ramírez Suárez, Alvaro. 1992. Mixed weed infestations : Prediction of crop losses for economic weed management in rice. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. 20 p.en
dcterms.extent20 p.en
dcterms.issued1992
dcterms.languageen
dcterms.publisherInternational Center for Tropical Agricultureen
dcterms.subjectoryza sativaen
dcterms.subjectriceen
dcterms.subjectweedsen
dcterms.subjectspacingen
dcterms.subjectweed controlen
dcterms.subjectcrop lossesen
dcterms.subjecteconomic thresholdsen
dcterms.subjectyieldsen
dcterms.subjectarrozen
dcterms.subjectmalezasen
dcterms.subjectespaciamientoen
dcterms.subjectcontrol de malezasen
dcterms.subjectpérdidas de la cosechaen
dcterms.subjectumbral económicoen
dcterms.subjectrendimientoen
dcterms.typeReport

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