Abstract:
A field experiment was conducted at Sher-e-Bangla Agricultural University farm,
Dhaka, during November-2019 to April 2020, to study the evaluation of growth and
yield of four modern rice varieties as influenced by seedling age. The experiment
consisted of two factors, and followed Randomized Complete Block Design (RCBD)
with three replications. Factor A: Different rice varieties (4) viz; V
1
: BRRI dhan84,
V
2
: BRRI dhan88, V
3
: BRRI dhan86, and V
4
: BRRI dhan89and Factor B:
Transplanting different age of seedling (3) viz: S
1
: 25 days, S
2
: 35 days and S
3
: 45
days old seedlings. Data on different parameters were collected for assessing results
for this experiment and showed significant variation in respect of growth, yield
contributing characteristics and yield of Boro rice due to the effect of different rice
variety, seedling age and their combinations. The highest number of tillers hill
was
produced by BRRI dhan89 at all days after transplanting. The highest, number of
effective tillers hill
-1
(16.86), panicle length (27.19 cm), filled grains panicle
(152.75), 1000 grains weight (28.39 g), grain yield (6.69 t ha
1
), biological yield (14.42 t ha
-1
-1
-1
), straw yield (7.74 t ha
) and harvest index (46.26 %) were recorded in BRRI
dhan89variety (V
4
). In case of seedling age, transplanting 25 days old seedling
provided the highest number of tillers hill
-1
compared to transplanted 35- and 45-days
old seedling. The values of all parameters studied were the highest in transplanting 25
days old seedling, except number of non-effective tillers hill
-1
and number of unfilled
grainspanicle
-1
. The height 1000 seeds weight (26.24 g), grain yield (6.92 t ha
straw yield (8.29 t ha
-1
), biological yield (15.19 t ha
-1
) and harvest index (45.40 %)
were recorded in transplanting 25 days old seedlings (S
1
). In case of combined effect,
BRRI dhan 89 along with transplanting at 25 days old seedling producedthe highest
grain yield (7.86 t ha
-1
) compared to other treatment combination. Thus, BRRI dhan89
and 25 days old seedling will be suitablefor optimum yield in respective edaphicclimatic
conditions.
-1
-1
-
),
Description:
A Thesis
Submitted to the Department of Agricultural Botany,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE
IN
AGRICULTURAL BOTANY
SEMESTER: JANUARY-JUNE, 2021
