Abstract:
A field experiment was conducted in Lalmai-hill area of Cumilla with five recently
BRRI released rice varieties during boro season (2018-2019) to evaluate their yield
performance under different transplanting dates. Rice seedlings were transplanted on
three different dates viz., January 15 (T
1
), January 30 (T
2
) and February 14 (T
3
) which
were considered as transplanting date treatments. Five rice varieties viz., BRRI dhan67
(V
1
), BRRI dhan68 (V
2
), BRRI dhan74 (V
3
), BRRI dhan81 (V
4
) and BRRI dhan86 (V
5
)
were considered as varietal treatments. Results showed that transplanting date had great
impact on growth and yield of boro rice. Advancement of transplanting date or delaying
of transplanting date decreased effective tillers, filled grains panicle
, total grains
panicle
─1
, thousand grain weight, grain yield, biological yield and harvest index.
Compared to early-planted seedlings (T
1
), late-planted seedlings (T
3
) decreased
effective tiller hill
─1
, filled grains panicle
─1
, grain yield and biological yield by 13, 14,
24 and 9%, respectively. Varietal variation also influenced the growth and yield of rice.
The highest grain yield (5.95 t ha
─1
) and biological yield (14.33 t ha
─1
) were obtained
from BRRI dhan74 compared with other varieties because of higher potentiality of its
yield attributes. Combination of transplanting date and variety also influenced growth
and yield of boro rice. The highest grain yield (6.67 t ha
─1
) and yield return in terms of
monetary advantages (Tk. 158765 ha
–1
) were recorded from BRRI dhan74 when
transplanted on January 15 whereas, lowest grain yield (3.36 t ha
–1
) and yield return
(Tk. 98350 ha
–1
) were recorded from BRRI dhan86 when planted on February 14.
Transplanting of all other varieties on January 15 confirmed higher yield and yield
return compared with delayed transplanting (January 30 and February 14). However,
transplanting of any boro rice seedling after January 30 decreased growth, yield and
yield return in Lalmai-Hill area.
Description:
A Thesis
Submitted to the Department of Agronomy, Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka in partial
fulfillment of the requirement for the degree of
MASTER OF SCIENCE (MS)
IN
AGRONOMY
