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EFFECT OF DESICCANTS ON SEED STORABILITY AND PULSE BEETLE INFESTATION IN GREENGRAM [Vigna radiata (L.) Wilczek]

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Title EFFECT OF DESICCANTS ON SEED STORABILITY AND PULSE BEETLE INFESTATION IN GREENGRAM [Vigna radiata (L.) Wilczek]
 
Creator LAKSHMI PRASAD, A
 
Contributor RAZIA SULTANA
 
Subject planting, stevia, stevia rebaudiana, sowing, yields, carbohydrates, developmental stages, vegetative propagation, rapd, genetics
 
Description The present investigation was undertaken with the main objective to determine
the effect of desiccants on seed drying, seed storage and its effect on pulse beetle
infestation in greengram [Vigna radiata (L.) Wilczek] at the Department of Seed
Science and Technology, ANGRAU, Rajendranagar, Hyderabad. The treatments
included for seed drying and storage using different desiccants were drying beads
(zeolite), sodium aluminium silicate, activated alumina, silica gel, cow dung ash and
were compared with storage in cloth bag and hermetic container under ambient
conditions. The experiment was laid out in completely randomized block design.
The study revealed that the drying beads reduced the seed moisture to an
extent of 38.87% followed by sodium aluminium silicate (37.57%). The initial seed
moisture content of 9.98 % was lowered to 6.10 % within 68 h of seed drying by
drying beads (zeolite) whereas, sodium aluminium silicate has taken 72 h to reduce it
to 6.23 per cent. The same was confirmed with lowest values of water activity (0.14
Aw) and relative humidity (16 %) with seed dried over drying beads. Seed
germination and seedling vigour were not significantly affected by the extent and
speed of seed drying after 72 h and remained the same as that of initial quality in all
the treatments.
Studies made on the effect of different desiccants on seed storability and seed
quality revealed that among all treatments drying beads found to be superior in
maintaining low seed moisture content of 6.06 per cent after nine months of storage
period, followed by sodium aluminium silicate (6.07 %). The moisture content in the
seeds stored in cloth bag had fluctuated with the ambient environmental conditions
during the entire storage period and recorded 8.18 % seed moisture content. No
significant change in moisture content was observed in seed stored in hermetic
container.
Seed stored with drying beads recorded highest germination, seedling vigour
indices I and II, germination rate and field emergence (92 %, 2806, 15828, 0.19 and
81 % respectively) followed by sodium aluminium silicate (90 %, 2701, 14936, 0.18
and 79 % respectively) compared to the seeds kept in hermetic container without
desiccants (80 %, 2407, 12799, 0.14 and 64 % respectively) and cloth bag (79 %,
2272, 12713, 0.14 and 63 % respectively) at the end of nine months of storage period.
Seed stored with drying beads recorded lowest number of fungal colonies (5
%) and electrical conductivity (664 μS cm-1) followed by sodium aluminium silicate
(7 % and 711 μS cm-1 respectively) whereas, the seed stored in hermetic container
without desiccant (19 % and 909 μS cm-1 respectively) and in cloth bag (19 % and 883
μS cm-1 respectively) kept under ambient conditions recorded the highest values for
these traits.
A study on evaluation of desiccants on pulse beetle infestation revealed that
greengram seed stored with drying beads recorded less seed damage (9 per cent),
oviposition (10 eggs/10 g of seed), insect activity in terms of available CO2 (0.5 per
cent) and O2 (20.1 per cent) content in the hermetic container and also expressed
higher seed germination (91 per cent), seedling vigour index I (2702) and seedling
vigour index II (15479) after six months of storage compared to other treatments. The
sodium aluminium silicate desiccant was also efficient and was on par with drying
beads in its performance and recorded less infestation of pulse beetle in terms of seed
damage (9 per cent) and oviposition (12 eggs/10 g of seed) along with high
germination (89 per cent), seedling vigour index I (2642) and seedling vigour index II
(14893). The initial seed moisture content of 10.20 per cent was drastically dropped to
6.22 per cent by drying beads followed by sodium aluminium silicate (6.25 per cent),
within a period of one month of storage which is the crucial period for bruchids
damage if already field infestation was present. These observations suggest that
hermetic storage of greengram seed with drying beads may give a better protection
from bruchid damage by restricting its multiplication.
Therefore, it can be concluded that the seed drying beads (zeolite) can safely
be used for rapid seed drying without impairment in seed quality and can offer
protection against pulse beetle infestation besides simultaneously maintaining seed
quality during storage.
 
Date 2016-06-14T11:29:26Z
2016-06-14T11:29:26Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67325
 
Language en
 
Relation D9316;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY