Abstract:
A research work was carried out at the Agronomy Farm, Sher-e-Bangla
Agricultural University, and Dhaka during the period from November 2012 to
June 2013 in order to determine the suitable nitrogen source to observe the
growth performance with a view to increasing the grain yield by reducing
spikelet sterility in boro rice. The experiment comprised four sources of nitrogen
viz. no nitrogen, BRRI recommended dose of prilled Urea, Govt. approved dose
of mixed NPK and BARC recommended dose of urea super granule (USG), and
four varieties viz. BRRI dhan29, BRRI dhan58, BADC SL8H and Heera. The
experiment was set up in a split-plot design with three replications. Experimental
results indicated that nitrogen sources had significant effect on plant height,
tillers hill
-1
,
effective tillers hill
-1
, non-effective tillers hill
-1
, grains panicle
,
unfilled grains panicle
-1
, spikelet sterility (%), grain yield, straw yield, biological
yield and harvest index. The application of USG showed the highest grain yield
(8.64 t ha
-1
) and the lowest spikelet sterility (%) than any of nitrogen and other
sources of nitrogen treatments. All the studied characters except harvest index
varied significantly due to varieties. Among the varieties, BRRI dhan29 out
-1 yielded Heera, BADC SL8H and BRRI dhan58 by 0.85, 1.13 and 1.98 t ha
,
respectively which is mainly attributable to the highest number of grains panicle
1
(98.57) and markedly lower level of spikelet sterility (11.13 %). The
combination of the USG application and BRRI dhan29 had the higher
performance in terms of producing the highest grain yield by significant
reduction of spikelet sterility (%) among the interaction effects.
-1
-
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfilment of the requirements
for the degree of
MASTER OF SCIENCE
IN
AGRONOMY
SEMESTER: JANUARY-JUNE, 2012
