Screening of weed-competitive variety of transplant aman rice, its optimum nitrogen dose and plant spacing for effective weed management
Two experiments were conducted at the Bangladesh Agricultural University, Mymensingh to screen out the highly competitive variety of transplant aman rice and to find out its appropriate weed management practices. Twelve varieties namely BR22, BR23, BRRI dhan30, BRRIdhan31, BRRIdhan32, BRRIdhan3...
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| Main Authors: | , , |
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| Format: | Non-Indexed Article |
| Published: |
2014
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| Online Access: | http://discol.umk.edu.my/id/eprint/7965/ |
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| Summary: | Two experiments were conducted at the Bangladesh Agricultural University, Mymensingh to screen
out the highly competitive variety of transplant aman rice and to find out its appropriate weed
management practices. Twelve varieties namely BR22, BR23, BRRI dhan30, BRRIdhan31,
BRRIdhan32, BRRIdhan34, BRRIdhan37, BRRIdhan38, BRRIdhan39, BRRIdhan40, Binasail and
Binadhan-4 were grown in presence and in absence of the weed Echinochloa crusgalli. Monoculture
of the weed was also maintained. The aggressivity of rice varieties was measured against the weed.
The study was further expanded in finding out the best nitrogen dose and plant spacing for providing
the selected variety with more competitiveness. Finally the yield performance of the selected rice
under the selected management practices was assessed. Variety BRRI dhan30 was found to be the
most competitive (aggressivity = 0.43) and Binadhan4 was the least competitive variety (aggressivity
= 0.05). The nitrogen dose of 80 kg N ha-1
competitiveness (aggressivity = 0.60) to the variety under the condition of experiments. The variety
BRRI dhan30 also produced the highest grain yield (5.2 t ha-1
due to weed competition under the management practices.
and plant spacing of 25 cm X 15 cm rendered the best |
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