Isolated and combined effect of allelopathic plants water extracts for weed management in maize.
Current study was designed under laboratory condition (Pots trials). The specific objective of the study was to evaluate the most effective, ecofriendly and an economical treatment for weed management in maize through various allelopathic plant aqueous extracts. Selected allelopathic plant species were collected from farmer fields. All the plants were cleaned, dried in oven and grinned. The grinned powders were soaked in distilled water according to treatments in the ratio of 1:10 (w/v) or 100 g/L and kept at room temperature. Atrazine 38 SC (atrazine) @ 100 g/L was used as recommended herbicide. Distilled water treatment was also included for comparison. All the treatments were applied on maize, T. portulicastrum and L. regidum seeds. Data on Germination (%), Shoot Length (cm) and Dry Biomass (g) was recorded. Results showed that S. bicolor, H. annuus and P. hysterophorus (WE) @ 33.33+33.33+33.33 (g/L) reduced dry biomass of T. portulacastrum and L. regidum by 35-41%, whereas the commercial herbicide ranged from 45-47%. Maize seeds were found more tolerant as compared to weed species. Furthermore allelopathic plant water extracts applied in combination had more inhibitory effect than their sole application, however the efficacy of commercial herbicide was more pronounced in suppressing the germination and seedling growth of test species. Hence it is concluded from the current study that allelopathy could be a potential source for designing an alternative to synthetic herbicide. Results showed that S. bicolor, H. annuus and P. hysterophorus WE @ 33.33+33.33+33.33 (g/L) reduced the dry biomass of T. portulacastrum and L. regidum by 54-68% and 35-41%, whereas the commercial herbicide.