ADAPTABILITY STUDIES IN BAJRA (Pennisetum americanum) x NAPIER (Pennisetum purpureum) HYBRIDS
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Date
1986
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present investigations were conducted for
critical assessment of adaptability of promising Bajra ( P.
araericanum) x Napier (P.purpureum) hybrids* Ten genotypes were
evaluated for this study at two sites in Rahuri during the
kharif, winter and summer seasons of 1984-85,
Green forage yield and its seven components viz,,
number of tillers, length of tiller, girth of tiller, number of
leaves, length of leaves, breadth of leaves and L/S ratio and
three quality characters viz,, T.S.S., per cent crude protein
and per cent, ash were studied. Significant G x E interaction
was observed for all the characters studied at both sites as
well as when pooled over six environments. Linear component of
G x E interaction played important role in the expression of
characters like girth of tiller, number of leaves, breadth of
leaves, green forage yield per plant and T.S.S, over six
environments. Pooled deviations (non-linear) effects were
significant for all characters except per cent crude^protein
content at both locations. The kharif season was graded as the
most favourable environment which was followed by summer. The genotypes, RBN-4 and RBN-9, with promising
performance and adaptability to poor environments for most of
the characters and general adaptability to few characters,
appeared to be the most promising. None of the genotypes was
found stable for all characters. PBN genotypes in general
indicated more suitablity to rich environments. Inconsistency
in respect of stability of the genotypes over seasons at
individual sitesand six environments when pooled, suggested
the necessity of sampling maximum number of environments for
assessing the adaptability of the genotypes.
L.Length of tiller, length of leaves and breadth of
leaves had significant positive correlation coefficients with
green forage yield. These characters also exhibited positive
direct effect and positive indirect effects of number of other
yield components through them suggesting their importance while
selecting for improvement in green forage yield.1 The genotypes
exhibiting particular type of stability for yield were not
necessarily observed to exhibit the same type of stability for
its correlated characters.
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