Resumo

OSORIO SALAZAR, Liliana et al. Evaluation of cuban hemp, nut sedge, johnson grass and herb of grace extracts in weed control. Acta Agron. [online]. 2009, vol.58, n.2, pp.103-107. ISSN 0120-2812.

The objective of this work was to evaluate the effect of the extracts of the species Macrophylla furcraea Baker (cuban hemp), Cyperus rotundus L (nut sedge), Sorghum bicolor L (johnson grass) and Ruta graveolens L (herb of grace) on seed germination of two weeds and one crop. The extracts were obtained by the Soxhlet method, using water, ethanol and chloroform as solvents. Each extract was evaluated in three dilutions (0, 5 and 10 % v/v) and was applied to Bidens pilosa L (spanish needle), Amaranthus dubius Mart (spleen amaranth) and Coriandrum sativum L (coriander) seeds. Three replications of 50 seeds each one were used and the control was watered only with destilled water. The results showed that the ethanolics and chlorofórmics extracts of nut sedge and cuban hemp at two evaluated dilutions presented high inhibiting effect on the seed germination of the three species at 21 days. The field test verified the inhibiting effect on seed germination of the ethanolics extracts of cuban hemp and nut sedge on coriander. The secondary metabolites test showed the presence of great amount of compounds reported like highly toxic in fique and in smaller amounts in coquito although this specie inhibited the seed germination highly.

Palavras-chave : Allelopathic; Macrophylla furcraea; Cyperus rotundus; Ruta graveolens; Sorghum bicolor; Bidens pilosa; Amaranthus dubius; Coriandrum sativum; germination; weed control.

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