Varibility Study in Sweet Potato (Ipomoea batatas L.) Cultivars Under Kolhapur Condition
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Date
2015
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present investigation entitled “Variability study in
sweet potato (Ipomoea batatas L.) cultivars under Kolhapur
condition’’ was carried out at the Research Farm, Horticulture
Farm, College of Agriculture, Kolhapur during summer, 2014
with the objective to study the genetic variability for yield and
yield contributing characters, genetic advance and correlation in
sweet potato cultivars.
The experiment was laid out in randomized block design
with sixteen treatments and two replications. The observations
were recorded on qualitative characters i.e. colour of peel and flesh colour and quantitative characters viz., length of vine (m),
number of primary branches vine-1, intermodal length (cm),
volume of tuber (ml), length of tuber (cm), number of tubers vine
1, girth of tubers (cm), weight of peel (g), weight of flesh (g), flesh
to peel ratio, average weight of tuber (g), tuber yield vine-1 (Kg),
marketable yield (t ha-1), total yield of tubers (t ha-1), days
required for maturity of tubers and per cent incidence of root
weevil. Considerable amount of variability was observed for all
the studied characters. The high GCV and PCV were observed for
marketable yield (69.86 and 70.31), tuber yield vine-1 (68.74 and
69.28) indicating the presence of good amount of variability for
these characters. Comparatively high heritability (b.s.)
percentage was observed for average weight of tuber (98.90),
marketable yield (98.70) and volume of tuber (98.50). It indicate
that these characters are least influenced by environmental
effects. The genetic advance was maximum for average weight of
tuber (126.94), weight of flesh (118.27) and volume of tuber
(110.00).
The characters viz., average weight of tuber, volume of
tuber, marketable yield and total yield of tubers had exhibited
high heritability coupled with high genetic advance as per cent
mean indicating that these traits under the control of additive
type of gene action can be easily improved by simple selection
method. The characters like tuber yield vine-1, length of vine,
intermodal length, flesh to peel ratio and weight of peel showed
high heritability with low genetic advance indicating importance
of non-additive gene action and therefore direct selection for these traits may not be effective and to minimize the dominance
effect the selection should be delayed.
The estimates of genotypic correlation, in general were slightly
higher than phenotypic correlation, indicating little masking or
modifying effects of environment on the expression of character.
The total yield of tuber exhibited positive and significant correlation
with volume of tuber, length of tuber, number of tuber vine-1, girth
of tuber, weight of peel, weight of flesh, flesh to peel ratio, average
weight of tuber, tuber yield vine-1, marketable yield, days required
for maturity of tubers and insect damage while, negative and
significant correlation with number of primary branches vine-1 and
internodal length was noticed.
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