EFFECT OF SEED SIZE ON GERMINATION, VIGOUR GROWTH AND YIELD IN SUNFLOWER
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Date
1992
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Journal ISSN
Volume Title
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ANDHRA PRADESH AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
A field experiment was conducted at Student's Farm,
College of Agriculture, Rajendranagar, Hyderabad during
summer, 1989 to study the effect of seed size on germination,
vigour, growth and yield in different genotypes of
sunflower. Three genotypes of sunflower viz., Morden, EC-
68414 and APSH-11 were considered as main treatments and five
seed grades (sizes} i.e., seeds retained OIi'!'\ 6.0 mm sieve
(G1 }, seeds retained on 5.25 mm sieve (G 2), seeds retained on
4.75 mm sieve (G 3), seeds retained on 4.50 mm sieve (G 4 ), and
control (ungraded seed} considered as sub-treatments, each
treatment replicated four times in split plot design. The
results from the laboratory study revealed that seedlings
grown from large sized seeds recorded higher values of germination,
seedling vigour, root length, hypocotyl length and
field emergence as compared to small sized seeds and
ungraded. Whereas the ungraded seed exhibited superior
performance in respect to seedling vigour, root length,
hypocotyl length and field emergence, compared to small sized
seeds of seed retained on 4.75 mm sieve and 4.50 mm sieve.
The plants raised from large sized seeds exhibited
higher values of growth and yield components like plant
height, number of leaves per plant, stem girth, head diameter,
number of filled seeds per head, 100-seed weight, yield
per plant and yield/ha as compared to plants raised from
small sized seeds. Days to SO per cent flowering and
maturity was less in large sized seeds as compared to smaller
seeds. The oil content was also more in large sized seeds.
There was a positive and significant association between seed
sizes and plant characters whereas, the days to 50 per cent
flowering and days to maturity showed a negative association.
The crop raised from 6.00 mm seed grade gave maximum
recovery (89%, 74% and 82% in Morden, EC 68414 and APSH-11
respectively) and also superior to the remaining resultant
crops obtaind from 5.25 mm, 4.75 mm adn 4.50 mm seed grades
as well as ungraded seed (control). According to present
investigation 10.25 mm sieve as a top screen and 4.75 mm
sieve as a bottom screen is recommended for the purpose of
certification (for processing) of sunflower for obtaining
higher monetary returns and quality seed for the cultivars
studied.
Larger seed was found to be superior in respect of
germination, vigour, field performance and recovery. It is
also clear from the present investigation that even the
ungraded seed met the certification requirement with regard
to germination. Thus, posing a question as to the necessity
of grading. A varid conclusion in this regard would not be
drawn without information on the storability of seed and also
the performance of different seed lots under stress
conditions hence, there is a need for more comprehensive
studies including the above aspects.
Description
EFFECT OF SEED SIZE ON GERMINATION, VIGOUR GROWTH AND YIELD IN SUNFLOWER