A survey of weeds associated to irrigation canals and adjacent inundated rice fields at Finca El Cerrito, Guanacaste, Costa Rica.
DOI:
https://doi.org/10.15517/am.v7i1.24783Abstract
A weed survey was conducted on irrigation canals and neighboring inundated rice fields, at Finca El Cerrito, Liberia, Guanacaste, Costa Rica. Sampling was performed on two growing seasons contrasting in weather conditions (rainy and dry) during 1992. Each surveying point was subdivided in five habitats (levee, internal slope, external slope, bottom of canal, and neighboring rice field). Plant species, percent cover and phenological stage were recorded at each habitat. In addition, for each species the next parameters were estimated: Frecuency-Cover Index (IFC), and Relative Participation Index (IPR). IPR at the family level was also calculated. 131 species during the dry season, and 144 species during the rainy season were recorded, showing that there is a significant plant diversity associated to these irrigation canals. The levee showed the greatest amount of plant species, while crop fields the least. Poaceae was the most important family, followed by Cyperaceae, based on IPR. Echinochloa colonum showed high IFC values and appeared in all habitats; this species together with others such as Oryza rufipogon, O. latifolia, Cyperus iria, and several broadleaf weeds are carefully controlled in rice fields, but reproduce heavily on irrigation canals, and shed their seeds in irrigation water, thus reinfesting commercial fields.
Downloads
References
SANCHEZ, V.M. 1993 Caracterización de la vegetación silvestre circundante y asociada al cultivo del melón (Cucumis melo L.) e identificación de especies hospederas de los principales virus que lo infectan y sus vectores. Tesis de Licenciatura. Escuela de Ciencias Biológicas. Universidad Nacional. Heredia, Costa Rica. 92 p.
SOTO, A.; AGÜERO, R. 1992. Combate químico de malezas en arroz. San José, Costa Rica, Editorial Universidad de Costa Rica. 81 p.
THOMAS, A.G. 1991. Floristic composition and relative abundance of weeds in annual crops. Weed Science. 33 (1): 34-43.
Downloads
Published
How to Cite
Issue
Section
License
1. Proposed policy for open access journals
Authors who publish in this journal accept the following conditions:
a. Authors retain the copyright and assign to the journal the right to the first publication, with the work registered under the attribution, non-commercial and no-derivative license from Creative Commons, which allows third parties to use what has been published as long as they mention the authorship of the work and upon first publication in this journal, the work may not be used for commercial purposes and the publications may not be used to remix, transform or create another work.
b. Authors may enter into additional independent contractual arrangements for the non-exclusive distribution of the version of the article published in this journal (e.g., including it in an institutional repository or publishing it in a book) provided that they clearly indicate that the work was first published in this journal.
c. Authors are permitted and encouraged to publish their work on the Internet (e.g. on institutional or personal pages) before and during the review and publication process, as it may lead to productive exchanges and faster and wider dissemination of published work (see The Effect of Open Access).
