5-2-14-Ullah et al


M.J.Ullah*, J. RahmanM. Yeasmin, K. Fatima, M. Quamruzzaman
*Corresponding author; E-mail: Jafarullahsau@gmail.com

 The experiment was conducted at the weed museum of Sher-e-Bangla Agricultural University, Dhaka to evaluate the allelopathic effect of mikania on Fymbristylis miliacea during kharif season of 2013. Soil from the wheat field was collected, dried in sun and mixed with mikania fresh plants at 6 different rates (control, 2%, 4%, 6%, 8% and 10%; all of sundried soil by weight) and allowed weed seeds to germinate and grow within the soil in earthen pots. Results revealed that mikania (M) application showed significantly lower population of Fybristylis weed plant at 30 to 60 days after setting (DAS). Treatments 4 - 10% in comparison to control showed significantly lower number of Fymbristylis miliacea (46 - 76.50 pot-1 than the control (60.50 - 136.33 pot-1) reducing the Fymbristylis miliacea population by 34 - 44% due to mikania application. But higher plant heights (up to 38.50cm) were obtained with these treatments than control (up to 31cm).  In contrast to the population, Fymbristylis dry weight increased due to mikania application after 30 DAS. The highest above ground biomass of 5.33g pot-1 was obtained with 10% mikania at 60 DAS while the lowest of 5.04 - 5.37g pot-1 with control and M2 (i.e. 2%). M8 and M10 had significantly higher root biomass than others (up to 0.72g pot-1) at 45DAS than the non-treated ones (0.40g pot-1) and the mikania applications at 4-6% had significantly higher total biomass ranges of  around 6 g pot-1 at 60 DAS as compared to those of  other stages (2.0 - 5.5 g pot-1). Mikania application also showed increased ranges of per plant biomass (0.097-0.120 g plant-1) at 60 DAS than control (0.045 g plant-1).  Total number of all weeds pot-1 increased from 30 DAS (117- 156 pot-1) to 60 DAS (151 - 271 pot-1) and thereafter decreased at 90 DAS (66 - 141 pot-1) showing significantly the highest values with control. Conversely, mikania application increased the total weight of weeds (45 - 50 g pot-1) compared to control (30.55 g pot-1). Relative percentage by number (32 - 46%) of Fymbristylis miliacea gradually decreased due to mikania application by 12 - 25% over mikania treatments. In contrast, relative percentage by weight (11 - 21%) increased from 18 - 31% over the treatments. Fymbristylis miliacea control efficiency due to mikania application in respect of population significantly increased up to 22 - 64 over control. However in respect of dry weight, it was found only at 30 DAS (61 - 104%) over control.

Key words: Mikania, allelopathy, Fymbristylis miliacea and weed control.

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