Abstract:
A field experiment was conducted at the Agricultural Botany Experimental field of
Sher-e-Bangla Agricultural University (SAU), Dhaka during Aus season in March to
July 2010, with a view to study the effect of transplanting dates on the growth and
yield of hybrid rice varieties along with one modem variety. The experiment
consisted of two levels of treatments viz. A: Three varieties where two of them were
hybrids and one was inbred: Fleera2, Aloron (Hybrid) and BRRI dhan48 (Inbred). B:
Four transplanting dates: 16°' March. 31 March, 150' April and 301h April. The
experiment was laid out in randomized complete block design with three
a
replications./perimental results showed that transplanting dates and varieties
individually had significant effect on the growth and yield parameters like plant
height, number of total tiller hill, leaf area hilF1 . total dry weight (g hilt'), light
interception percent, chlorophyll content at flag leaf stage, number of effective tiller
hilt', panicle length, number of filled spikelet panicle', number of unfilled spikelet
panicle1, number of total spikelet panicle', spikelet filling percent, grain yield (t hi
5. straw yield (t ha'), biological yield (t ha') and harvest index (%)fFhe results
revealed that 16° March transplanting gave the highest grain yield (3.82 t ha
Chlorophyll content Was higher in Heera2 followed by, Aloron. In contrast chlorophyll
content was lower in BRRI dhan48. Among the varieties BRRI dhan48 gave the
highest grain yield (3.5 It ha1) but both the hybrid varieties Heera2 (3.03 t ha') and
Aloron (2.77 t ha4) gave lower grain yield due to higher spikelet sterility because of
more sensitiveness of hybrid rice varieties to high temperaPire and low sunshine hour
at grain filling stage. The combined effect of transplanting dates and variety had also
significant effect on yield and yield contributing characters. BRRI dhan48
transplanting on 161' March showed highest grain yield attaining good yield
contributing characters.
