Hybrid Paddy Seed Production Technology- AK Gupta, Ph.D

Location : Karimnagar, Kurnool, Warangal, Toopran, Shadnagar, Nizamabad, Miryalguda, Sattupally, Attur (T.N), Mysore (Karnataka)
Soil type : Preferably red soils, Light black soils. Saline soils & deep cotton soils are not preferred. If compulsory use Gypsum for Saline soils. There is a difference of 2 days in flowering between both the parents from red soil to black soil. In black soils - difference between flowering increases by 2 days
Season : Preferably Rabi (Post rainy or Dry season), Kharif (Wet season) normally results in low seed yields.
Days to flower : Andhra .Pradesh (Rabi/DS) Andhra Pradesh (Kharif/WS) Tamilnadu (Early Rabi) Mysore (WS/Kharif) Sowing Period :
Rabi season (DS) : 15th Nov (1st male) to 5th Dec . Sowings after 10th Dec results in low Yields.
Kharif Season (WS) : 25th May to 30th June. Kharif sowings are risky & normally results in low seed yields. Chances of grain deterioration & Poor germination..
Early Rabi (Attur -Tamilnadu) : 15th Sep to 15th October
Staggering : Differ for Hybrid patents
Note: Male parent is Photo & Thermosensitive, Male parent takes more number of days to flower particularly in late sowings after 10th Dec. Thus male flowering gets delayed by 5-8 days . Poor nicking results in poor seed set.
Seed Rate : Male Parent :3 kg & Female Parent 5 kg per acre (Note: Need to use more seed of male parent in order to increase plant population to get more pollen load).
Transplanting: Rabi & Early Rabi: Transplant male parent first when 2nd sown male seedlings are of 25-30 days old, followed by female parent.
Kharif (WS) : Transplant male parent first when 2nd sown male seedlings are of 30 days old. Give 4-5 days gap then transplant female parent when seedlings are of 22-25 days old.(If gap is more than 4-5 days between two transplantings, soil becomes hard to transplant. Transplanting in hard soil reduces root growth & prevents root penetration in the soil, which results poor growth of the plant.
GA-3:Spray 12gms (60 ppm) GA-3 at 5-10% flowering and 8 gms (40 ppm) at 35-40% flowering during evening hours. Late or too early spray give negative effect. Give 1-2 sprays (2gms of GA-3 per spray) only to male parent separately to increase plant height.
Supplementary Pollination : with stick is more effective. Need to engage minimum of 4 persons per acre. Supplementary pollination needs to be done 4-5 times during anthesis. That is normally between 10.30 a.m. to 12.30 p.m.
Physiological Maturity including tillers : Female Parent : 145 days in normally-may differ for hybrids parents
Days to harvest at 18%-20% moisture including bottom spikelets of tillers : Female Parent : 155-160 days(may vary for hybrids parents wise)
Average Yield per acre : Male parent 500-800 kg & Female Parent 600-800 kg
Water Stress Condition : Male parent advances in flowering
Key success factorsMore male plant population to get more pollen.Timely sowing & TransplantingHigh Crop management.Effective Supplementary pollinationEffective & efficient field monitoring.