Weed population dynamics in rice crops resulting from post-emergent herbicide applications

Published

2017-01-01

Dinámica poblacional de malezas en cultivos de arroz por aplicaciones herbicidas post-emergentes

Keywords:

Weed control, Echinochloa colona, Community structure, Importance Value Index (IVI) (en)
Control de malezas, Echinochloa colona, Estructura de la comunidad, Índice de Valor de importancia (es)

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Authors

Javier Ramírez Universidad Nacional de Colombia
Verónica Hoyos Universidad Nacional de Colombia
Guido Plaza Universidad Nacional de Colombia

Abstract (en)
Abstract (es)

Studies on weed population dynamics are based on observing and recording changes in weed communities in response to effects of disturbances in crop management. The present study aimed to evaluate weed population dynamics in rice crops in Tolima, Colombia, resulting from post-emergent herbicide applications. Sampling was carried out in 0.1% of the cultivated area, marking out a 1 ha area in each commercial lot. Samples were taken before and after post-emergent applications. Evaluated variables were frequency, density, and cover. The data were analyzed using the Importance Value Index (IVI). Results demonstrated that Echinochloa colona was the most important weed of all of the evaluated zones, before and after post-emergent herbicide applications. Other notable species included Digitaria ciliaris, Cyperus iria and Ischaemum rugosum. Relative frequency variable was the most influential on the importance index of the species. Furthermore, herbicide applications generated changes in the community structure in the evaluated zones and in each evaluation.

Los estudios de dinámica de poblaciones se basan en el conocimiento y registro de cambios en las comunidades de malezas en respuesta a efectos de disturbio propios del manejo del cultivo. En el trabajo se evaluó la dinámica de poblaciones de malezas del cultivo de arroz en el departamento del Tolima, Colombia, por efecto de aplicaciones con herbicidas post-emergentes. Se muestreó el 0,1% del área sembrada, demarcando un área de 1 ha en cada lote comercial. Los muestreos se realizaron antes y después de las aplicaciones post-emergentes. Las variables evaluadas fueron frecuencia, densidad y cobertura y los datos se analizaron mediante el índice de valor de importancia (IVI). Los resultados muestran que Echinochloa colona fue la maleza más importante en todas las zonas evaluadas, antes y después de las aplicaciones herbicidas post-emergentes. Igualmente sobresalieron especies como, Digitaria ciliaris, Cyperus iria e Ischaemum rugosum. La frecuencia relativa fue la variable estimada más influyente en la determinación de la importancia de las especies. Las aplicaciones de herbicidas generaron cambios en la estructura de la comunidad en las zonas evaluadas y en cada evaluación.

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