Abstract:
A field experiment was carried out at the Agronomy Field of Slier-e-Bangla
Agricultural University, Dhaka during the period of June to November 2006 to study
the growth and yield of inbred and hybrid rice with tiller separation at different
growth periods. The experiment was conducted with two levels of treatments viz. A.
Variety: BRRldhan 32
and Sonarbangla-1 and B. Tiller separation days: 20, 25,
30,
35 and 40 days aller transplantation. The experiment was laid out in split-plot design
with 3 replications. Experimental results showed that variety had significant effect on
all the studied parameters like plant height, number of tillers hill', total dry weight,
dry weight of root, dry weight of stem, dry weight of leaf total grains panicle", tilled
grains panicle
-', 1000-grain weight, grain yield, biological yield and harvest index
except effective tiller, ineftèctive tiller, panicle length, rachis branch panicle", unfilled
grains panicle' and straw yield. Significantly the highest grain yield (5.46 t hi) was
obtained from the hybrid variety compared to the inbred variety (4.54 t haj. The
hybrid variety showed the highest harvest index (47.53%)
and 1000-grain weight
(27.12 g) compared to BRRidhan 32 but the highest number of total grains and filled
grains panicl&' as well as flowering and maturity duration was found in inbred variety
compared to hybrid variety. Tiller separation days also significantly influenced all the
growth and yield attributes except panicle length, rachis branch panicle'', total grains
panicle*', 1000-grain weight and harvest index. The tiller separation ranging from 20
to 30 days after transplantation (DAT) showed significantly the best performance than
other tiller separation days. The highest grain yield (5.62 t hi') was obtained from the
tiller separation at 20 DAT whereas the lowest grain yield (4.28 t haj was obtained
from the tiller separation at 40 DAT. Maximum filled grains panicle*' (144.28) was
observed from the tiller separation at 20 DAT. Total and effective tillers hill
1
was
affected by tiller separation beyond 30 DAT. Delayed tiller separation extended the
flowering and maturity duration. Therefore, it was concluded that earlier tiller
separation (20-25 DAT) resulted higher grain yield in hybrid variety but no such
variations was observed in inbred variety.