| dc.description.abstract | Nine fine rice genotypes were evaluated to evaluate the heritability, variability of
yield and yield contributing characters and to asses the relationship among them.
The nine varieties were Salsira, Binni pakri, Bolder, Joitha kathari, Ukni modhu,
Salna, Radhuni pagol, BRRI dhan 49 and Katarivog. The experiments were
conducted in the Plant Breeding Research Field, Hajee Mohammad Danesh
Science and Technology University (HSTU), Dinajpur. The experiment was
conducted in the completely randomized block design (RCBD) with three
replications. The data collected on the following plant characters-plant height
(cm), tillers/hill (maximum vegetative stage), number of grain/panicle, number of
non-filled grain/panicle, days to 50% flowering, days to maturity, panicle length
(cm), racillae/panicle, spikelet length (mm) and yield (t/ha). The outcomes of the
study vividly focused that the yield potential of the fine rice cultivars were low
but the highest yield (3.48 t/ha) was obtained from the cultivar, Katarivog
followed by Salna (3.17t/ha), BRRI dhan 49 and salsira (3.08t/ha) while joitha
katari was the lower performer (2.97 t/ha). Strong but negative relationship was
measured between tillers/hill and yield (-0.238) indicated that tillers/hill alone
played remarkable influenced to reduce yield in fine rice cultivars. The highest
and negative correlated response (-0.238) was paid by tillers/hill and rest all the
characters showed positive correlated response with yield and as a single
character, In addition, productive non-filled grain no. alone developed strong
response to selection (0.653) when yield is considered to be increased. The nonfilled grain number (88.203%) and plant height (76.503%) showed high
heritability next to yield and effective panicle length (13.980%) showed low
heritability. Most of the characters showed high heritability couple with low
genetic advance, but high genetic advance (112.4%) indicated that the character
may response well under favorable growing conditions. The highest heritability
value (h2
b=88.20366%) was estimated for number of non-filled grain therefore,
amenable of grain length by modifying cultural environment is very difficult in
fine rice. Nonetheless, the magnitude of heritability for yield (t/ha) was also high
((h2
b=86.567%) but genetic progress under direct selection would offer only
26.65%, consequently direct selection on yield alone would be effective for
improving yield potential along with others approaches of plant breeding need to
be applied for sustainable improvement of fine rice. The overall result of the study
revealed that significant variation among the genotypes for all the characters
studied and Selection would be effective for increasing grain yield with
simultaneous consideration of tillers/hill and panicle length. | en_US |
