STUDIES ON APPLICATION OF POLYMER, SPERMINE AND SCAPE REGULATION ON SEED YIELD AND QUALITY IN ONION (Allium cepa L.) AND GARLIC (Allium sativum L.)
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Date
2018
Authors
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DIVISION OF SEED SCIENCE AND TECHNOLOGY ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
Abstract
The present investigation entitled “Studies on application of polymer, spermine and
scape regulation on seed yield and quality in onion (Allium cepa L.) and garlic (Allium
sativum L) was conducted at Seed Production Unit during rabi 2015-16 and 2016-17
with the objectives to study the effect of application of polymers, plant protectants,
spermine and scape regulation on growth, disease intensity, thrips incidence, seed
yield and seed quality. Onion mother bulb coating with polymer and 0.15 % fipronil +
0.25 % (carbendazim + mancozeb ) showed significantly higher values for seed yield
attributes viz, productive scapes plant-1 (5.56), umbel diameter (6.97cm), 1000 seed
weight (3.44 g), seed yield plant-1 (21.15 g), seed quality attributes-seedling length
(10.18 cm), seed vigour index-I (923.42), seed vigour index-II (1752.10), lowest
scape lodging (21.16%), EC (188.38 µmhos/cm/g), percent disease index (34.96) and
thrips plant-1 (5.35). The residue of fipronil and carbendazim after 30 DAP in polymer
coated bulbs were 2.04 ppm and 0.60 ppm where as pesticides applied as water
soaking was 0.36 ppm and 0.05 ppm respectively.In garlic seed crop the application
of polymer along with 0.25 % (carbendazim + mancozeb ) gave highest clove
sprouting. Polymer coating and 0.15 % fipronil + 0.25 % (carbendazim + mancozeb )
showed significantly higher values for characteristics viz. bulb diameter, (4.43 cm),
lower percent disease incidence (27.95) and No. of thrips plant-1
(1.17), whereas
polymer coating along with 0.15 % fipronil had highest cloves bulb-1 (22.74) and yield
plant-1 (17.48 g).
Per-harvest spray of 1.00mM spermine recorded highest seed quality when
germinated under favorable conditions. Plants sprayed with (0.25mM) spermine
recorded lowest deterioration due to accelerated ageing, highest germination (70.33
%), seedling length (9.52 cm), seedling dry weight (16.03 mg), seed vigour index-I
(666.36), seed vigour index-II (1114.77), SOD (0.032 unit/min/g of seed), POD
(0.117 ∆/min/g of seed). After one year of ambient storage plants sprayed with 1.00
mM per-harvest recorded highest seed viability and vigor. Seed priming with 1.25
mM spermine recorded significantly higher seed quality attributes over unprimed
seeds, but were at par with halo-priming. Seeds priming with 1.25mM spermine had
minimal deterioration effects of accelerated ageing and recorded the highest seed
quality attributes viz. germination (59.33 %), speed of germination (1.54), seedling
length (9.10 cm),seedling dry weight (20.10 mg), seed vigour index-I (541.03), seed
103
vigour index-II (1072.47), SOD (0.11 unit/min/g of seed) and POD (0.03 ∆/min/g of
seed).
Scape regulation showed significant influence on seed quality. The scape
length and umbel diameter were significantly higher in plants retained up to three
scapes plant-1
. Highest number of florets umbel-1
(727.75), seeds umbel-1
(1464.62) was
recorded in plants with one scape plant-1
. Plants with single scape produced 88.78 %
more seed yield umbel-1
in comparison to plants with six scapes plant-1
. Seed quality
parameters like 1000 seed weight, speed of germination and seed vigour was higher in
plants up to four scape plant-1
.
Key words: Allium cepa L., Allium sativum L., polymer, disease, thrips, spermine,
scape regulation.
Description
t-10001
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