| dc.description.abstract | A field experiment was carried out at the Farmers’ Field at village Patnipara, Chicknagul union
under Jointapur Upazila in Sylhet district during the period from November 2012 to June 2013
under Agroecological Zone 20 (Eastern Surma- Kushiyara Floodplain) to observe the
performance of variety and seedling age on the growth, yield and economic performances of
high yielding and local varieties of boro rice. Four varieties viz. BRRI dhan28, BRRI dhan29,
Khoiaboro and Begunbichi, and three seedling ages viz. 15, 20 and 25 day-old were included as
experimental treatments. The experiment was laid out in a factorial RCBD (Randomized
Complete Block Design) with three replications. The characters plant height, total number of
tiller hill
-1
, length of
panicle, number of total spikelet panicle
, number of effective tiller hill
-1
, number of non-effective tiller plant
-1
, 1000-grain
weight, grain yield, straw yield and harvest index studied in the experiment were varied
significantly among the varieties. The results revealed that BRRI dhan29 produced significantly
highest grain yield (6.25 t ha
-1
, grain panicle, unfilled spikelet panicle
-1
, grain
panicle
-1
) attributed by the higher number of effective tiller hill
-1
-1
and 1000-grain weight. BRRI dhan28 produced the second highest grain yield (5.37 t
ha
-1
) in spite of
its highest number of grain panicle
) while the local variety Begunbichi produced the lowest grain yield (2.26 t ha
-1
because of its small sized grain. Total number of spikelet
panicle
-1
-1
, grain and straw yield varied
significantly but the other characters did not among different ages of seedlings. The highest grain
yield (4.49 t ha
, number of grain panicle
-1
, unfilled spikelet panicle
-1
-1
) was obtained from 25 day-old seedling ascribed to higher number grain
panicle
-1
produced by 20 day-old seedling was statistically similar to
that of 25 and 15 day-old seedlings. Interaction of variety and seedling age produced significant
effect on most of the characters except plant height, number of non-effective tiller hill
. Grain yield of 4.23 t ha
-1
, length
of panicle and grain yield. Variety Khoiaboro produced the highest number of effective tiller
hill
-1
-1
(51.5). Local variety Begunbichi
produced the highest number of grain panicle
(25.47) having the lowest number of grain panicle
-1
(171.7) with 20 day-old seedling statistically
similar to that of 25 day-old seedling (167.7 grain panicle
-1
) of the same. Cost and return analysis
showed that BRRI dhan29 gave maximum gross, net returns and BCR of Tk. 128360.00,
Tk. 51102.00 and 1.66, respectively with 25 day-old seedling. Interestingly, local variety
Begunbichi showed more profitability than BRRI dhan28 and Khoiaboro rice varieties.
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