Adaptation of some cold tolerant Rice genotypes in Haor areas of Bangladesh
Paper Details
Adaptation of some cold tolerant Rice genotypes in Haor areas of Bangladesh
Abstract
Rice is the most important staple crops of Bangladesh. In the haor (low lying) areas of Bangladesh, early planted dry season (November–May) rice has to face cold stress at the early seedling to reproductive stages. The growers of the haor areas consider their dry season rice as a chance crop as it might encounter the flash flood at the maturity stage. Three cold tolerant advanced lines IR100722-B-B-B-B-11, IR100723-B-B-B-B-61, TP16199 along with BRRI dhan28 and BRRI dhan67 as checks were evaluated in ten locations especially haor areas in Bangladesh during the dry season 2021-22. Across the environments and genotypes, the advanced line IR100722-B-B-B-B-11 gave a slightly higher mean grains yield (4.96t/ha) than the other IR100723-B-B-B-B-61, TP16199 tested entries (4.75t/ha, 4.77t/ha) and significantly higher yield than check variety BRRI dhan67 (4.68t/ha) and BRRI dhan28 (4.09t/ha). The growth duration of the highest grains yielder IR100722-B-B-B-B-11 was 151 days. On the other hand, the mean growth duration of the other two advance lines (IR100723-B-B-B-B-61 and TP16199) was 150 and 155 days respectively which was 7-10 days higher than the two check varieties BRRI dhan28 and BRRI dhan67 (145 and 147 days). The highest number of mean grains per panicle (86) was produced by BRRI dhan67. Therefore, the three advanced lines IR100722-B-B-B-B-11, IR100723-B-B-B-B-61, and TP16199 was not suitable for the haor areas for its longer growth duration for the chance of damage by early flash flood, although it has cold tolerance ability. Among the genotypes, none of the advanced tested lines was recommended for advance stage like Proposed Variety Trial.
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