5-1-12-Ullah et al


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


A study was carried out at the weed museum of Sher-e-Bangla Agricultural University, Dhaka to evaluate the allelopathic effect of mikania on purple and yellow nutsedges during kharif season of 2013. Soil from the wheat field was collected, sun dried 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 the weed seeds to germinate and grow within the soil in earthen pots. Mikania application had greater effect at 30 to 60 days after setting (DAS) than at 90 DAS.  Treatments 4 – 10% in comparison to control showed significantly lower number of sedges (37.67 - 42.5 pot-1 than the control (48 – 69 pot-1) reducing the sedge population by 22-36% due to mikania application. But higher plant heights (39 - 76 cm) were obtained with these two treatments than control (28 - 61 cm).  The highest above ground biomass of 7.68 - 23.42 g pot-1 was obtained with 10% mikania while the lowest ( 4.35 - 11.30 g pot-1) with control. Mikania applied pots had significantly higher root biomass (2.33 - 5.81 g)) than the non-treated ones (2.- 2.54 g pot-1) and the mikania applications at or over 4% treatments had significantly higher total biomass ranges of  6.75 - 28.64 g pot-1 as compared to 0 - 2% (6.48 - 16.19 g pot-1). Mikania application also showed increased ranges of per plant biomass (0.159 - 0.498 g plant-1) than control and 2% (0.134 - 0.197 g plant-1).  Total number of 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 highest values with control. Relative percentage by number of sedges gradually decreased from 30 (37 %) to 90 DAS (2.94%). Sedge control efficiency with mikania application on plant number basis was significantly increased up to 38% with 6% rate which was significantly higher than control.

Keywords: Mikania, allelopathy, weed control

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