Resumo

DOTOR ROBAYO, Mónica  e  CABEZAS GUTIERREZ, Marco. DETERMINATION OF COMPETITIVE ABILITY BETWEEN Daucus carota L. AND Senecio vulgaris L.. rev.udcaactual.divulg.cient. [online]. 2015, vol.18, n.1, pp.81-89. ISSN 0123-4226.

From the agricultural perspective, knowing the level of competition between a crop and invasive plants can predict yield losses and establish the importance of proper management of weeds during the production process. To contribute to the understanding of this process, a test to know the competitive ability between species such as Senecio vulgaris L. and Daucus carota L. was carried out. A completely randomized experimental design with four treatments and five replicates was used in order to identify the individual and combined effect of water and light on the development and production of these species. It was observed that when growing D. carota under full competition and without competition the plant shows a root:shoot allometric relationship (4:1), but under limiting water and light conditions, this relationship changes, apparently seeking to compensate the intake of the limited resource. Losses in the crop species were higher under competition for water, showing a higher percentage of biomass allocation to the root (74%), but a lower dry biomass production and storage. It can be assumed, that this factor is critical for the vegetable, showing losses of 43% compared to the treatment without competition. In the case of S. vulgaris the variation in total biomass production was significant, so it is probable that in difference to the cultivated species, the weed develops a pattern of growth competition adjustment.

Palavras-chave : Weeds; inter-specific competition; allometric relationships.

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