STUDIES ON SEED PRODUCTION TECHNIQUES AND STORABILITY OF KARNATAKA RICE HYBRID-2
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Date
2001-08-03
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
The field and laboratory experiments conducted at the University of Agricultural
Sciences, Dharwad during 1995 - 98 on seed production and storability of Kamataka Rice
Hybrid - 2 revealed that spraying of gibberellic acid @ 75 g per ha, flag leaf clipping
(FLC)+GA3 50 g per ha. and GA3 25 g per ha. coupled with NAA or Arappu leaf extract
increased the panicle exersion, seed set and seed yield by 47.4, 45.7, 44.3 and 34.8 per cWit,
respectively, over the control. The net returns were higher with GA3 25 g per ha + 100 ppm
NAA and GA3 25 g per ha + 2.0 per cent urea. AU chemicals, except boric acid produced better
quality seeds and improved the storability. Summer season produced higher seed yield with
better quality.
The early sowing of male parent by four and eight days resulted in better
synchronisation, increased seed set and seed yield. The foliar spray at panicle initiation stage
with of GA3 (100 PPM) and single super phosphate (1.0%) enhanced the 50 per cent flowering
in male parent by 3.7 and 3.2 days, respectively, while additional application of N (25 kg / ha) to
soil coupled with foliar spray of urea (2.0 %) and MH @ 400 ppm to female parent delayed
50 per cent flowering by 4.7 and 3.5 days, respectively, over the control. The seed yield and
quality were higher with the seed produced at Dharwad than Gangavati location.
The 50 per cent flowering was delayed with December sowing, but it was early with
August sowing in all the parental lines. Transplanting of 30 days old seedlings of A, B and R
lines gave higher seed yield and quality as compared to transplanting of younger or older
seedlings.
The seeds produced at Dharwad stored better than the ones produced at Sirsi. The
seeds stored in polythene bag (700 gauge) were superior over cloth bag throughtout the storage
period for all the seed quahty parameters. The untreated seeds lost their viabihty and vigow at a
faster rate during storage compared to Thiram (2.0 g / kg) treated seeds.
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