EFFECT OF SEED COATING ON SEED LONGEVITY IN RICE (Oryza sativa L.)
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Date
2019-07
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CSKHPKV, Palampur
Abstract
The present investigation was undertaken to evaluate the effect of seed coating for
seed longevity and to identify the effective seed coating treatment for enchancing seed
longevity of rice by evaluating different seed quality parameters in Seed Technology
Laboratory, CSK HPKV, Palampur. The experimental material consisted of HPR-1068
variety of rice, seeds of which were coated during December 2015 and nine different
treatments along with untreated control in three replications were stored in Completely
Randomized Design (CRD) for thirty six months (December 2015 to December 2018) after
packing in HDPE (high density polyethylene) interwoven bags. For the present study, the
evaluation of seed quality parameters was made at bimonthly intervals for twelve months
(25th to 36th month) i.e from January 2018 to December 2018. The treatments comprised of
T1 - untreated control, T2 - polymer (Polykote) @ 3 ml/kg of seed diluted in 5 ml of water, T3
- flowable thiram @ 2.4 ml/kg of seed, T4 - polymer + flowable thiram @ 2.4 ml/kg of seed,
T5 - vitavax 200 @ 2 g/kg of seed, T6 - polymer + vitavax 200 @ 2 g/kg of seed, T7 -
imidacloprid (Gaucho) @ 4 ml/kg of seed, T8 - polymer + imidacloprid (Gaucho) @ 4 ml/kg
of seed, T9 - polymer + flowable thiram @ 2.4 ml/kg of seed + imidacloprid (Gaucho) @
4 ml/kg of seed and T10 - polymer + vitavax 200 @ 2 g/kg of seed + imidacloprid (Gaucho) @
4 ml/kg of seed. At the end of storage period (36 months), recorded data revealed that
irrespective of seed coating, seed deteriorated and the vigour declined probably with
increased fungal infection and aging of seed. On the basis of present study, it can be
concluded that T6 - polymer + vitavax 200 @ 2 g/kg of seed and T4 - polymer + flowable
thiram @ 2.4 ml/kg of seed were found significantly superior for all seed quality parameters
viz., germination (%) - first count (%), final count (%), speed of germination, seedling length
(cm), seedling dry weight (g), seedling vigour index-I, seedling vigour index -II, electrical
conductivity (m mho/cm/g) and field emergence (%) over T1 - untreated control. The
treatments, polymer coating @ 3 ml/kg of seed + vitavax 200 @ 2 g/kg of seed and
polymer coating @ 3 ml/kg of seed + flowable thiram @ 2.4 ml/kg of seed could
maintain the germination percentage above Indian Minimum Seed Certification
Standards (IMSCS) upto 32 months of storage and thus these two treatments can be
used for long term storage of paddy seeds.
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