Structure, size and production of weed seeds in the humid tropic.
DOI:
https://doi.org/10.15517/am.v11i1.17337Abstract
The objectives of this study were to determine the average dimensions, to describe the external structure of seeds, fruits or spikelets and to estimate the number produced per plant and per gram of twelve weed species. Propagules sketchs were elaborated. The number of seeds per plant varied from 1290 in Asclepias curassavica to 195.008 in Ludwigia sp within the dycotyledoneae. The second specie with the highest average number of seeds per plant was Sida rhombifolia (7962) followed by Ipomoea sp.(2876). Hyptis capitata showed a higher number of heads per plant (341) than Bidens pilosa (106). Mimosa pudica produced an average of 3.3 seeds per fruit. In relation to Poaceae species Paspalum conjugatum y P. Virgatum produced a larger number of spikelets per floral branch (381 y 1185 respectively) than Ischaemum indicum (81) and Rottboellia cochinchinensis (14). Anemocory, hydrocory and zoocory are mentioned as mechanisms contributing to dispersal of these species.
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References
ALAN, E. 1999. Fenología del arroz (Oriza sativa) irrigado y malezas asociadas en Bagatzi. Guanacaste, Costa Rica. Tecnología en Marcha 13: 31-34.
ALAN, E.; BARRANTES, U.; AGüERO, R.; SOTO, A. 1994. Fenología del arroz (Oryza sativa L.) bajo riego y malezas asociadas en Bagatzí, Guanacaste, Costa Rica. San José, C.R. Resúmenes XL Reunión Anual Programa Cooperativo Centroamericano para el mejoramiento de cultivos y animales (PCCMCA). 13-20Marzo, 1994. San José, C.R.
ALAN, E.; BARRANTES, U.; SOTO, A.; AGÜERO, R. 1995. Elementos para el manejo de malezas en agroecosistemas tropicales. Cartago (C.R.) Editorial Tecnológica de Costa Rica. 224 p.
BAKER, H.B. 1974. The evolution of weeds. Ann. Rev. Ecol. Syst. 5: 1-24
BRISTOW, M. 1983. Las malezas de San Carlos. Turrialba, Costa Rica. Centro Agronómico Tropical de Investigación y Enseñanza (CATIE). s.p.
CALDERÓN-FLORES, J. 1994. Germinación y morfología de semillas de malezas presentes en la región de San Carlos, Costa Rica. Tesis Ing. Agr. Instituto Tecnológico de Costa Rica. Departamento de Agronomía. Santa Clara. 99 p.
FENNER, M. 1985. Seed ecology. New York USA. Chapman and Hall. 152 p.
FLORES, E. 1991. La planta. Cartago (C.R.) Editorial Tecnológica de Costa Rica. 501 p.
FOSTER, S. 1982. On the adaptive of large seeds for tropical moist forest trees: A review and synthesis. Botanical Review 52(3): 260-299.
GÓMEZ-ARISTIZÁBAL, A.; RIVERA-POSADA, M. 1987. Descripción de malezas en plantaciones de café. Chinchiná, Colombia. CENICAFE. 490 p.
HOLDRIDGE, L. 1987. Ecología basada en zonas de vida. San José, Costa Rica. Instituto Interamericano de Cooperación para la Agricultura. 216 p.
KLINGMAN, G.; ASHTON, F. 1980. Estudio de las plantas nocivas. Principios y prácticas. México, D.F. LIMUSA. 449 p.
POHL, W.R. 1980. Family 15: Gramineae. In: BURGER, W. (ed). Flora Costaricensis. Fieldiana Botany. United States of America. Field Museum of Natural History. 608p.(New Series Number 4).
RADOSEVICH, S.; HOLT, J. 1984. Weed ecology. New York (USA). John Wiley. 263 p.
SIEBERT, A.; PEARCE, R. 1993. Growth analysis of weed and crop species with reference to seed weight. Weed Sci. 41: 52-56
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