ADAPTABILITY UNDER PREDICTABLE ENVIRONMENTS IN AMARANTHUS (Amaranthus hypochondriacus L.)
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Date
1995
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present investigations were conducted for
critical assessment of adaptability of nine promising Amaranth
genotypes. The field experiments comprising nine genotypes were
conducted in a R.B.D. with three replications during the period
from October, 1993 to February, 1994, under four environments
created by different sowing dates and fertilizer levels i.e. E^
- Sowing on Ist Oct. with 20+40+20 kg NPK/ha, E2 - sowing on Ist
Oct. with 80+40+20 kg NPK/ha, E3 - sowing on Ist Nov. with
20+40+20 kg NPK/ha, E4 - sowing on Ist Nov. with 80+40+20 kg
NPK/ha.
Stability parameters as per Eberhart and Russell
(1966), Perkins and Jinks (1968) and Freeman and Perkins (1971)
models, were estimated for eight components. Estimation of
environmental indices (Ij) suggested E~ environment i.e. sowing on first Oct. with per hectare 80+40+20 kg NPK, respectively, as
the most favourable environment for yield and most of its
components.
Out of ten characters studied, GxE interaction was
detected for eight characters Viz., days for fifty per cent
flowering, plant height at flowering, number of spikelets per
plant, length of inflorescence, girth of inflorescence, leaf
area pm plant and grain protein content. Pooled deviation, the
non-lineat component of GxE interaction was significant for
seven characters Viz., days to 50 per cent flowering, plant
height <\\ flowering, length of inflorescence, girth of
inflorescence, leaf area at flowering, grain yield per plant and
grain protein content. The linear component of GxE was
significant for four characters viz., number of branches and
number of spikelets per plant, grain yield per plant and gram
protein content. In Freeman and Perkins (1971) model, the
estimates of bi values for days to 50 per cent flowering and
maturity differed from those of Eberhart and Russel (1966) and
Perkins and Jinks (1968) model. The S di values estimated by
Eberhait and Russell (1966) and Perkins and Jinks (1968) were
quite different from those of Freeman and Perkins (1971). The
estimates of all the stability parameters Viz., mean, bi and
2 S di values were, however similar in the case of Eberhart and
Russell (1966) and Perkins and Jinks (1968). The promising genotypes with wider adaptability for
yield components according to Eberhart and Russell (1966) and
Perkins and Jinks (1968) models were IC-32642, IC-42256 and AG
114, while the genotypes, IC-32186 and IC-35642 were having
specific adaptability for number of spikelets per plant and
grain protein content respectively, hence can be made use for
telease of new varieties after further testing or can be used as
the parents for generating the breeding material for development
of new Amaranthus varieties with wider adaptability over
environments or with specific adaptability to a particular
environment for desirable attributes.
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