ADAPTABILITY STUDIES IN FORAGE SWEET SORGHUM (Sorghum bricolor L. (Moench)
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Date
1990
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Mahatma Phule Krishi Vidyapeeth, Rahuri
Abstract
The present Investigations were conducted for critical
assessment of adaptability of promising sweet sorghum genotypes.
Thirteen genotypes were evaluated for this study at Grass
Breeding Scheme, Rahuri, during the/ziiarif, Rabi, Summer and early
Kharlf of 1988-89.
Genotype x environment interaction was detected for
all the eleven characters studied. Linear component shared
major poi.uion of total G x E interaction for leaf length, where
as, non-linear components were in preponderance in respect of
fifty per cent flowering, plant height, number of leaves, leaf
breadth, L/S ratio, green forage yield, dry forage yield,
incidence of shoot fly, T.s.s. and per cent crude protein.
Estimates of environmental indices (lj) suggested that
kharif (late) 1988, (Ej), season as favourable for the high
incidence of shoot fly and early flowering as compared to other
environments.
The rabi (E~), environment was favourable for L/S ratio,
T.S.S. low incidence of shoot fly and per cent crude protein, while summer (E3) was favourable for days to fifty per cent late flowering and leaf breadth. The early kharif (E..) was.
however, favourable environment for number of leaves per
plant, plant height, leaf length, green forage and dry forage
yield per plant.
The genotypes viz, RFSS 7 (leaf length, VS ratio,
incidence of shoot fly, T.s.s,), RFSS 20 (days for fifty per
cent flowering (late), T,s.s.), RFSS 23 (number of leaves,
green and dry forage yield), RFSS 35 (days to fifty per cent
flowering, late), RFSS 57 (days to fifty per cent flowering
(late), T.S.S.), RFSS 76 (leaf breadth), RFSS 112 (late
flowering), RFSS 128 (plant height, leaf length), RFSS 1502
(dry forage yield), RFSS 1966 (leaf length) and RFSS 56 (green
forage yield) had general adaptability over seasons.
The genotypes viz, RFSS 10 (days to fifty per cent
flowering (late), number of leaves, leaf length), RFSS 76 ,
(days to fifty per cent flowering (late), green and dry forage
yield, and crude protein), RFSS 1502 (number of leaves, T,S,S,).
RFSS 1966 (1/S ratio, incidence of shoot fly) were suited to
favourable season like early kharif.
In general, RFSS 112 had above average stability for
important forage yield attributes like number of leaves, plant
height, I/S ratio and dry forage yield and incidence of shoot
fly, RFSS 128 also for days to fifty per cent flowering (late),
leaf breadth, incidence of shoot fly, T,s,s, and RFSS 1966 for
days to fifty per cent flowering (early), leaf breadth and crude
protein content also had sdmilar type of adaptability thus, these
genotypes showed their suitability to poor season like late kharif
use of the genotypes with either general (wider) or
season specific adaptability in the development of new varieties
with desired nature of adaptability, is suggested.
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