Hybrid Sorghum(Sorghum biccolor)

HYBRID SEED PRODUCTION

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1. SEASON

October-December for hybrid. June-July and October-November for varieties.

2.SOWING

To achieve synchronised flowering of the parental lines and quick disposal of the produce, sowingthe parental lines from 15th November to 15th January is most advantageous. The flowering period should coincide with cool and low temperature for proper seed set. Under Coimbatore conditions for CSH 5 the female parent (MS 2077A) must be sown 10-15 days earlier to the male (CS 3541), for K tall MS 2219-A must be sown 3-5 days later to IS 3541 and for CSH 6 the female parent (MS 2077A) must be sown 10-15 daya earlier to the male (CS 3541), for K tall MS 2219-A must be sown 3-5 days later to IS 3541 and for CSH 6 the female parent MS 2219-A can be sown simultaneously, with CS 3541 and for CSH 9 the female parent MS 206 A must be sown 7-10 days earlier than male CS 3541 in November-December season.

Presowing hardening: Soak the graded seeds with 2% Potassium dihydrogen phosphate (KH2PO4) for 10 hrs. and dry back to original moisture content. The same may be further seed treated before sowing.

3. PLANTED RATIO

4:2 at F.S. and 5:2 at C.S. Spacing: 45 x 10 cm

4. FERTILIZERS

100:50:50 kg NPK/ha, 50:50:50 as basal, 25:0:0 top dressing after weeding; 25:0:0 kg at boot leaf stage (i.e 45th day of sowing

5. TO ACHIEVE SYNCHRONISATION:

1. Spraying growth retardant Maleic hydrazide 500 ppm at 45th day after sowing delays flowering in advancing parent.

2. N in the form of urea 1% can be sprayed to the logging parent.

3. With-hold one irrigation in advancing parent.

4. Take up staggered sowing.

5. Spraying CCC 300 ppm will delay flowering

6. Pre-harvest sanitation spray: Spraying of Carbendazim or Carboxin for black mould attacked or rain soaked earheads.

6. PHYSIOLOGICAL MATURITY:

Attains physiological maturity 40-45 days after half-bloom stage when seed moisture content would be 30 per cent.

7.HARVEST:

Harvest the male rows first and then the female

8. THRESHING:

At a seed moisture content of 15-18 per cent.

9. SIEVE SIZE:

9/64" round perforated sieve.

10.STORAGE:

Dry the seeds to safe moisture content of 7 per cent. Treat with Neem leaf or nochi leaf and pack it in cloth bag for short term and in 700 gauge polythene bag for long term storage.

11.MILD STORAGE CORRECTION:

Oilseeds with declioning viability maybe upgraded and soaked for 6 hrs in double the volume of Disodium hydrogen phosphate (3.59 g/100 l water) and quickly dried back to 8% moisture content.