Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado.
Effects of two tillage systems on red rice (Oryza sativa L.) populations in a flooded rice agroecosystem. The influence of two tillage systems was evaluated on red rice (Oryza sativa L.) populations and other frequent weeds in rice agroecosystems throughout four consecutive cycles of commercial flooded rice. In order to estimate the seed bank size, soil samples from three depths (0 to 5, 5 to 20 and 20 to 40 cm) were taken at the beginning of each crop cycle. The density of the most abundant weeds in the crop area was also measured. In both tillage systems there were significant differences in emerged weeds and seed banks. While the red rice seed bank and its emerged populations on the field presented incremental trends in conventional mechanized sowing (CMS), a progressive decrease in bank size and a lower density was observed in direct seeding into stubble (DSS), during cycles in which no tillage was used. Populations of annual sedges like Cyperus spp. and Fimbristylis milliaceae increased in both tillage systems, with greater intensity in CMS. The vertical distribution of the weed seed bank in the soil was also different for both tillage systems. In DSS more than 66% of the red rice seed bank and 82% of the germinated seeds were found within the first five cm of the soil profile. It is concluded that the DDS system promotes favorable conditions to maintain control over red rice populations and other weeds in flooded rice.
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Universidad de Costa Rica
2005
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oai:portal.ucr.ac.cr:article51832023-06-16T13:54:57Z Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. Ortega, Yemel M. Agüero-Alvarado, Renán Effects of two tillage systems on red rice (Oryza sativa L.) populations in a flooded rice agroecosystem. The influence of two tillage systems was evaluated on red rice (Oryza sativa L.) populations and other frequent weeds in rice agroecosystems throughout four consecutive cycles of commercial flooded rice. In order to estimate the seed bank size, soil samples from three depths (0 to 5, 5 to 20 and 20 to 40 cm) were taken at the beginning of each crop cycle. The density of the most abundant weeds in the crop area was also measured. In both tillage systems there were significant differences in emerged weeds and seed banks. While the red rice seed bank and its emerged populations on the field presented incremental trends in conventional mechanized sowing (CMS), a progressive decrease in bank size and a lower density was observed in direct seeding into stubble (DSS), during cycles in which no tillage was used. Populations of annual sedges like Cyperus spp. and Fimbristylis milliaceae increased in both tillage systems, with greater intensity in CMS. The vertical distribution of the weed seed bank in the soil was also different for both tillage systems. In DSS more than 66% of the red rice seed bank and 82% of the germinated seeds were found within the first five cm of the soil profile. It is concluded that the DDS system promotes favorable conditions to maintain control over red rice populations and other weeds in flooded rice. Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. Se evaluó la influencia de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) y de otras malezas frecuentes en agroecosistemas arroceros durante cuatro ciclos consecutivos de cultivo comercial de arroz inundado. Para estimar el tamaño del banco de semillas se tomaron muestras de suelo a tres profundidades (0 a 5, 5 -20 y 20 - 40 cm) al inicio de cada ciclo de cultivo. También se estimó la densidad de las malezas más abundantes emergidas dentro del área en cultivo. En ambos casos, hubo diferencias significativas entre los sistemas de siembra evaluados. Mientras que el banco de semillas de arroz rojo y sus poblaciones emergidas en el campo presentaron tendencias crecientes en labranza mecanizada convencional (LMC), se observó una reducción progresiva en el tamaño del banco y menor densidad, a medida que transcurrieron ciclos sin labranza en siembra directa sobre rastrojos (SDR). Las poblaciones de ciperáceas anuales como Cyperus spp. y Fimbristylis milliaceae incrementaron en ambos sistemas de siembra, pero con mayor intensidad en LMC. La distribución vertical del banco de semillas de malezas en el suelo también fue diferente entre sistemas de siembra. En SDR más del 66% del banco de semillas de arroz rojo y el 82% de las semillas que germinaron se encontraron en los primeros cinco cm del perfil del suelo. Los resultados pemitieron concluir que el sistema SDR promueve condiciones propicias para mantener control en las poblaciones de arroz rojo y de otras malezas en el cultivo de arroz inundado. Universidad de Costa Rica 2005-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf https://revistas.ucr.ac.cr/index.php/agromeso/article/view/5183 10.15517/am.v16i1.5183 Agronomía Mesoamericana; 2005: Agronomía Mesoamericana: Vol. 16, Issue 1 (January-June); 63-75 Agronomía Mesoamericana; 2005: Agronomía Mesoamericana: Vol 16, N° 1 (Enero-junio); 63-75 Agronomía Mesoamericana; 2005: Agronomía Mesoamericana: Vol. 16, Issue 1 (January-June); 63-75 2215-3608 1021-7444 spa https://revistas.ucr.ac.cr/index.php/agromeso/article/view/5183/4983 |
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Ortega, Yemel M. Agüero-Alvarado, Renán |
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Ortega, Yemel M. Agüero-Alvarado, Renán Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. |
author_facet |
Ortega, Yemel M. Agüero-Alvarado, Renán |
author_sort |
Ortega, Yemel M. |
title |
Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. |
title_short |
Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. |
title_full |
Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. |
title_fullStr |
Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. |
title_full_unstemmed |
Efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (Oryza sativa L.) en un agroecosistema arrocero inundado. |
title_sort |
efectos de dos sistemas de labranza sobre poblaciones de arroz rojo (oryza sativa l.) en un agroecosistema arrocero inundado. |
description |
Effects of two tillage systems on red rice (Oryza sativa L.) populations in a flooded rice agroecosystem. The influence of two tillage systems was evaluated on red rice (Oryza sativa L.) populations and other frequent weeds in rice agroecosystems throughout four consecutive cycles of commercial flooded rice. In order to estimate the seed bank size, soil samples from three depths (0 to 5, 5 to 20 and 20 to 40 cm) were taken at the beginning of each crop cycle. The density of the most abundant weeds in the crop area was also measured. In both tillage systems there were significant differences in emerged weeds and seed banks. While the red rice seed bank and its emerged populations on the field presented incremental trends in conventional mechanized sowing (CMS), a progressive decrease in bank size and a lower density was observed in direct seeding into stubble (DSS), during cycles in which no tillage was used. Populations of annual sedges like Cyperus spp. and Fimbristylis milliaceae increased in both tillage systems, with greater intensity in CMS. The vertical distribution of the weed seed bank in the soil was also different for both tillage systems. In DSS more than 66% of the red rice seed bank and 82% of the germinated seeds were found within the first five cm of the soil profile. It is concluded that the DDS system promotes favorable conditions to maintain control over red rice populations and other weeds in flooded rice. |
publisher |
Universidad de Costa Rica |
publishDate |
2005 |
url |
https://revistas.ucr.ac.cr/index.php/agromeso/article/view/5183 |
work_keys_str_mv |
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