Abstract
An experiment was conducted at a farmers field in Bakergonj Upazilla of Barisal district from July 2014 to October 2014 to study the adaptive performance of six aman rice varieties. The varieties included in the study were BRRI dhan62, BINA dhan7, BINA dhan8, BINA dhan10, BINA dhan11, and Maloti (local). The experiment was laid out in a randomized complete block design with three replications. Variety Maloti produced highest plant height (126cm) and BRRI dhan62 produced least plant height (93cm). Variety BINA dhan7 and BINA dhan11 produced highest LAI, total dry matter (g plant-1). Yield of different rice varieties varied significantly. Variety BINA dhan11 gave the highest yield (5.033 t ha-1) which was statistically at par with that of BINA dhan7 (5.00 t ha-1) and BINA dhan8 (4.50 t ha-1), BINA dhan10 (3.933t ha-1), BRRI dhan62 (4.167t ha-1). The highest grain yields of these varieties were obtained to the highest number of bearing tillers m-2. The lowest grain yield (3.50 t ha-1) and straw yield (4.840 t ha-1) were found in Maloti. The shortest period for first flowering (66 days) was observed in BRRI dhan62. Among the varieties, the longest maturity stage (139 days) was observed in local var. Maloti. While the shortest period was observed in BRRI dhan62 (94.5 days). So, the experiment concluded that BINA dhan11 was the highest performing short duration variety followed by BINA dhan7, while BRRI dhan62 and, BINAdhan8, BINAdhan10 performed better among the short duration varieties respectively during aman season to evade cyclonic effect and for cultivating boro rice in Bakergonj Upazilla of Barisal district.Asian J. Med. Biol. Res. June 2015, 1(2): 304-315
Highlights
The southern coastal region holds an environment different from other parts of Bangladesh
Plant height In all the six aman rice varieties, plant heights were significantly affected by different days after planting (Table 1)
Plant heights were higher in Maloti than that of Bangladesh Institute of Nuclear Agriculture (BINA) dhan7, BINAdhan-8, BINA dhan10, BINA dhan11, Bangladesh Rice Research Institute (BRRI) dhan62 respectively
Summary
The southern coastal region holds an environment different from other parts of Bangladesh. Cropping pattern is determined largely by the time of onset of monsoon; early monsoon encourages to grow aus during the kharif-I season otherwise the entire region becomes a single cropped area with transplanted aman rice only. People living this area reluctant to grow crops in rabi season due to scarcity of water. Crop agriculture is often constrained by different hazards and disasters such as floods, droughts, soil and water salinity, cyclones and storm surges (MoEF, 2009) It is very common phenomenon in coastal regions of this country. The main crop damaged was rice that was under cultivation during this Aman season (United Nation 2007)
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