J. Bio. Env. Sci.5(1), 492-500, July 2014
Weeds are one of the most important factors in reducing plant growth, however current methods for controlling them are not effective or have environmental problems. Allelopathic is emphasized recently as an effective way to control weeds. Therefore, a RCBD based factorial experiment was conducted in three replicates in greenhouse condition to evaluate allelopathic effect of Pepper mint on growth and seed production of redroot pigweed in 2013. Evaluated factors were: (1) Pepper mint extracts from different organs: (leaves, stems, mixture of leaves and stems), (2) Different concentrations of extracts: (0 (control), 10%, and 20%, (3) Different methods of extract using: soil and foliar application. The results showed that all extracts of Pepper mint caused significant decreasing on the growth and performance of pigweed. Pepper mint leaf extract 20% caused the highest reduction in pigweed plant height and shoot dry weight and showed 68.3, 86.6% less than control, respectively. Foliar application of leaf 20% extract concentration showed the highest reduction in plant height in comparison with control (68 %). Both 10% and 20% concentrations decreased leaf area, seed number per plant, seed weight per plant and 1000 kernel weight as 58.2, 57.8, 63.8 and 14.7%, compared to control, respectively and reduction in attributes was higher with increasing concentration of the extracts. Results indicated the strong controlling effect of Pepper mint extract on pigweed growth and seed production.
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