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Research Detail

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Dr. Mohammed Amin
Principal Scientific Officer
OFRD, Noakhali

The experiment was conducted at the FSRD site Noakhali during Rabi season of 2007-08 to find out the proper weed control method for soybean in char areas under AEZ 18. The highest yield (2.10 t/ha) of soybean was obtained from Ronstar (@ 2 L/ha spraying before sowing + one hand weeding at 45 DAS which was closely followed by two hand weeding at 25 and 45 DAS (2.08 t/ha). The lowest yield (1.66 t/ha)was found in farmers practice (One hand weeding at 25DAS). The highest gross return (Tk. 73500/ha) as well as gross margin (Tk.52010/ha) was recorded from Ronstar (@ 2 L/ha spraying before sowing + one hand weeding at 45 DAS followed by two hand weeding at 25 and 45 DAS.

  Herbicides, Handweeding, Weed, Soybean
  Noakhali and Laxmipur
  15-03-2008
  20-07-2008
  Pest Management
  Chemical weed management

To evaluate the effectiveness of pre-emergence herbicide and manual control of weeds at different stages of growth

The experiment was conducted at the farmer’s field in Noakhali and Laxmipur during the year of 2008-09.Shohag was used as variety in the experiment. There were four treatments namely,Farmers practice (One hand weeding at 25 DAS), Ronstar/Dual Gold (@ 2 L ha-1 spraying at before sowing),  Ronstar/Dual Gold (@ 2 L ha-1 spraying at before sowing) + One hand weeding at 45 DAS, Two hand weeding at 25 and 45 DAS, in each replication with at plot size 4 x 4 m2. Herbicidal treatments were done with hand sprayer. Samples of individual weed species were collected at 25 and 45 days after sowing. Data on weed counts and weed biomass were recorded. Yield and yield contributing data were taken at harvest. Collected data were analyzed statistically.

  Annual Research Report, 2007-08 and 2008-09 published by OFRD, BARI
  
Funding Source:
1.  Government Budget:  
  

The numbers of weeds per square meter were affected by herbicide and hand weeding in soybean.  Maximum number of weeds were found from farmers practice at 25 (57) and 45 ( 85) DAS and the minimum number of weeds were found in two hand weeding at 25(15) and 45 (25) DAS which was related to Ronstar/Dual Gold (@ 2 L ha-1 spraying at before sowing) + one hand weeding at 45 DAS (16, 25 respectively), Ronstar/ Dual Gold @ 2 L ha-1 spraying at before sowing + one hand weeding controlled (>80%) Chenopodium album L.,<70 % Cynodon dactylon, about 70% Echinocloa colonum and > 60% of Digtaria sanguinalis.Maximum weed biomass was found in farmers practice at 25(42.59 gm-2) and 45 (64.58 gm-2) DAS and the minimum was observed in Ronstar/Dual Gold @ 2 L ha-1 spraying at before sowing + one hand weeding it was at 25 (12.67 g-2) and 45 (19.36 gm-2) DAS and in two hand weeding at 25 and 45 DAS it was 11.70 gm-2, 19.86 g-2, respectively. The highest pods per plant were observed in two hand weeding at 25 and 45 DAS (35) which was similar to Ronstar/Dual Gold @ 2 L ha-1 at before sowing + one hand weeding at 45 DAS(35) and the lowest pods per plant was found in farmers practice (32). 1000 seed weight was statistically non-significant among the treatment. The maximum seed weight was found in two hand weeding at 25 and 45 DAS (110 g) and the minimum seed weight was found in farmers practice (100g). Maximum seed yield was recorded in two hand weeding at 25 and 45 DAS (2.29 t ha-1) and which was statistically identical with Ronstar @ 2 L ha-1 before sowing  + one hand weeding at 45 DAS (2.15 t ha-1) and the lowest yield was found in farmers practice (1.77 t ha-1). The highest gross margin (Tk. 52010) was found in treatment Ronstar (@ 2 L ha-1 spraying at  before sowing) + One hand weeding at 45 DASand the lowest (Tk. 38569) in Farmers practice (One hand weeding at 25DAS farmers practice (2.97).

  Report/Proceedings
  

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