Abstract:
An experiment was conducted at the field of Agricultural Botany Department, Shcr-eBangla
Agricultural University (SAU). Dhaka during Mis season from March to July
2010. with a view to study the influence of planting dates on the morphological and
yield attributes of hybrid rice varieties. The experiment consisted of two levels of
treatments viz. A: Three varieties where two of them were hybrids and one was
inbred: BRRI Hybrid dhan2, Tia and BRRI dhan48 (Inbred). B: Four transplanting
dates: 16th March, 3 1 " March, 15th April and 30th April. The experiment was laid out
in factorial randomized complete block design with three replications. Experimental
results indicated that transplanting dates and varieties individually had significant
effect on the growth and yield parameters like plant height, number of total tiller
hilt', leaf area hill", total dry weight (g hillj, 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 panicle", number of total spikelet
panicle1, spikelet filling percent. grain yield (t ha'1), straw yield (t ha"), biological
yield (t hi') and harvest index (%). The results revealed that 16" March transplanting
gave the highest grain yield. Chlorophyll content was higher in BRRI Hybrid dhan2
followed by Tia. In contrast chlorophyll content was lower in BRRI dhan48. Among
the varieties BRRI dhan48 gave the highest grain yield but both the hybrid varieties
BRRI Hybrid dhan2 and Tia gave lower grain yield due to higher spikelet sterility
because of more sensitiveness of hybrid rice varieties to high temperature 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 16th March showed highest grain yield attaining good yield
contributing characters.
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 (M. S.)
IN
AGRICULTURAL BOTANY
SEMESTER: JANUARY - JUNE, 2011
