Tillering duration and yielding ability of rice varieties in the winter rice season of Bangladesh
2001
Gomosta, A.R. | Quayyum, H.A. | Mahbub, A.A.
In Bangladesh, the winter rice crop (boro) is an irrigated crop. Among the three rice seasons of Bangladesh, it is the longest rice season, producing the highest grain yield. The winter season crop begins in November and ends in May. Farmers sow their seeds, however, between November and February. The tillering duration of the crop varies because of different sowing dates or transplanting dates in the winter season. The different duration of tillering has a positive association with the duration of low temperature (below 20°C), at which the vegetative phase of the crop is exposed. A longer crop duration allowed the tillers to become more mature, producing a higher number of panicles in the winter season. In the winter-season crop, the use of different-aged seedlings and time of seeding was more flexible for long-duration varieties than for short-duration varieties. A short-duration variety such as BR28 could produce 6 t of grain yield when 30-d-old seedlings from a November-seeded bed were used. Seedlin s from an October-seeded bed produced only 1-2 of grain yield. However, 30-90-d-old seedlings of BR29, a long-duration variety, produced 5-7 t of grain yield when seedlings from an October-seeded bed were used.
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