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espanolEl objetivo de la investigacion fue evaluar el potencial alelopatico de los extractos de crotalaria sobre la germinacion y el crecimiento inicial de maiz. Los ensayos se realizaron en el laboratorio y en el invernadero con cuatro concentraciones (0; 7,5; 15 y 30%) para los extractos acuosos obtenidos por molienda y lixiviacion. En camara de la germinacion se observo que los extractos mas concentrados (15 y 30%) inhibio la germinacion de maiz y que la longitud de la parte aerea (LPA) se estimulo a una concentracion de 7,5%. Para el extracto de molienda hubo estimulacion en longitud de la raiz (LR) en todas las concentraciones ensayadas. El numero de raices (NR) se inhibio a concentraciones mas altas de extracto de lixiviado y estimulo para las semillas expuestas a extracto machacado de crotalaria. En invernadero, la longitud de la raiz mas larga (LRL) de maiz se inhibio a la mayor concentracion (30%) de los extractos de ambas maneras obtenidos. El extracto machacado inhibio los LPA en todas las concentraciones y la concentracion de 7,5% estimulo la NR. Se concluyo que los extractos de crotalaria mostraron efecto alelopatico en el desarrollo de maiz, que variaba de acuerdo a como se obtuvieron los extractos y concentraciones utilizadas. EnglishThe objective of this study was to evaluate the allelopathic potential of sunn hemp extracts on germination and initial development of maize. The trials were carried out in the laboratory and greenhouse with four concentrations (0; 7.5; 15 and 30%) of aqueous extracts obtained by grinding and leaching. In a germination chamber, more concentrated extracts (15% and 30%) inhibited maize germination, while shoot length (SL) was stimulated at 7.5% concentration. Ground extract stimulated root length (RL) at all tested concentrations. Root number (RN) was inhibited at higher concentrations of leached extract and stimulated for seeds exposed to sunn hemp ground extract. In the greenhouse, the longest root length (LRL) of maize was inhibited at the highest concentration (30%) of both extracts. The ground extract inhibited the LS in all concentrations and the 7.5% concentration stimulated the RN. It was concluded that sunn hemp extracts showed allelopathic effect on maize development, which varied according to how the extracts were obtained and concentrations used.

Allelopathy of Crotalariajuncea L. aqueous extracts on germination and initial development of maize