Rice

Hybrid Rice

Agronomic Practices Hybrid Rice In India Hybrid Varieties

Agronomic practices for Tamilnadu hybrid rice

Particulars CORH 1 ADTRH 1 CORH 2
Parentage IR 62829A/ IR 10198-66-2R IR 58025A / 66R IR 58025A / C20R
Duration - - -
Days 110-115 115 125
Season Kar, Kuruvai and Sornavari Kar, Kuruvai and Sornavari Samba, Late Samba Navarai
NURSERY 20 kg/ha 20 kg/ha 20 kg/ha
Seed rate (1 kg/cent) (1 kg/cent) (1 kg/cent)
Area 20 cents 20 cents 20 cents
Seed treatment Carbendzim 2g/kg of seed Carbendzim 2g/kg of seed Carbendzim 2g/kg of seed
Manures / Fertilizer FYM / Compost 1 ton/ 20 cent (or) Green manure 500 kg DAP 2 kg/ cent at last ploughing FYM / Compost 1 ton /20 cent (or) Green manure 500 kg DAP 2 kg/ cent at last ploughing FYM / Compost 1 ton/ 20 cent (or) Green manure 500 kg DAP 2 kg/ cent at last ploughing
Biofertilizer Seed treatment with Azospirillum 600 g/ha (3 pockets) and phosphobacteria 3 pockets Seed treatment with Azospirillum 600 g/ha (3 pockets) and phosphobacteria 3 pockets Seed treatment with Azospirillum 600 g/ha (3 pockets) and phosphobacteria 3 pockets
Weed control Butachlor / Thiobencarb 10ml/ cent (or) Anilophos 5ml / cent 6-8 DAS applied by mixing with sand Butachlor / Thiobencarb 10ml/ cent (or) Anilophos 5ml / cent 6-8 DAS applied by mixing with sand Butachlor / Thiobencarb 10ml/ cent (or) Anilophos 5ml / cent 6-8 DAS applied by mixing with sand
Seedling age (days) 20-25 25 25-30
Main field
Field preparation Well puddled and levelled field Well puddled and levelled field Well puddled and levelled field
Organic manure FYM/ Compost 12.5 ton/ha (or) Green manure 6.25 t/ha FYM/ Compost 12.5 ton/ha (or) Green manure 6.25 t/ha FYM/ Compost 12.5 ton/ha (or) Green manure 6.25 t/ha
Fertilizer schedule NPK (kg/ha)
ZnSo4 (kg/ha)
150:50:50

25
150:50:50

25
150:50:50

25
Gypsum (kg/ha) 500 500 500
Biofertilizer Azospirillum 10 pockets (2 kg/ha) and phosphobacteria 2 kg/ha Azospirillum 10 pockets (2 kg/ha) and phosphobacteria 2 kg/ha Azospirillum 10 pockets (2 kg/ha) and phosphobacteria 2 kg/ha
Basal NPK (kg/ha) 50:50:25 50:50:25 50:50:25
Planting
Number of seedlings/hill One One One
Spacing (cm) 20 x 10 20 x 10 20 x 10
Population (Sqm) 50 hills 50 hills 50 hills
Planting depth (cm) 2-3 2-3 2-3
Weed control Butachlor / Thiobencarb 2.5 lit/ha (or) Anilophos 2.250 lit/ha 3-5 DAT followed by one hand weeding Butachlor / Thiobencarb 2.5 lit/ha (or) Anilophos 2.250 lit/ha 3-5 DAT followed by one hand weeding Butachlor / Thiobencarb 2.5 lit/ha (or) Anilophos 2.250 lit/ha 3-5 DAT followed by one hand weeding
Top dressing (N and K kg/ha) 25 (15 DAT) 25 (15 DAT) 30 (20 DAT)
I - - -
II 25 (30 DAT)
25 		25 (30 DAT)
25 		30 (40 DAT)
30
III 25 (45 DAT)
- 		25 (45 DAT)
- 		30 (60 DAT)
-
Water Management - - -
Irrigation depth Irrigation to 5cm depth Irrigation to 5cm depth Irrigation to 5cm depth
Critical stages Panicle initiation 45-50 DAS Panicle initiation 45-50 DAS Panicle initiation 65-70 DAS
  Heading stage
75-80 DAS 		Heading stage
75-80 DAS 		Heading stage
95-100 DAS
Last irrigation 10 days before harvest 10 days before harvest 10 days before harvest
Plant protection

Harvest 		IPM-Need based


At physiological maturity when 80% of panicles turn yellow 		IPM-Need based


At physiological maturity when 80% of panicles turn yellow 		IPM-Need based


At physiological maturity when 80% of panicles turn yellow
Yield 5.9 ton/ha 18.8% increased yield over IR 50 6.4 ton/ha 6.1 ton/ha

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Hybrid Rice In India

  • The population growth in India is estimated at 1.9% per annum which needs an annual food production of 220 million tonnes by 2000-02 and 240 million tonnes by 2000-2007.
  • The growth rate in rice production, which reached 4.4% in the eighties has come down to 2.3% in the nineties. We should strive hard to achieve a minimum annual growth rate of 2.5% of rice production.
  • Among the various strategies proposed to break the yield plateau in rice productivity, exploitation of heterosis through the development of "Hybrid rice" has proved successful.

Rice hybrids released in India

Hybrid Year of release Parentage Duration Yield (t/ha) Yield advantage over standard check (%)
Check
Hybrid Standard
CORH1 (MGR)

1994

IR 62829A/ 10198R

110-115

6.08

5.23
(IR 50)

16.2

APRH1

1994

IR 58025A/ VAJRAM R

130-135

7.14

5.27
(Chaitanya)

35.4

APRH2

1994

IR 62829A/ MTU 992R

120-125

7.52

7.52 (Chaitanya)

44.2

KRH1

1994

IR 58025A/ IR 9671 R

120-130

6.02

4.58
(Mangale)

31.4

CNRH3

1995

IR 62829A/ Ajaya R

125-130

7.49

5.45
(Khitish)

37.4

DRRH1

1996

IR 58025A/
IR 40750

125-130

7.30

5.50
(Tellahamsa)

32.7

KRH2

1996

IR 58025A/ KMR 3R

130-135

7.40

6.10
(Jaya)

21.3

ADTRH1

1998

IR 58025A/ IR 66 R

110-115

6.43

5.51
(CORH1)

44.9

CORH2

1998

IR 58025A/ C20 R

120-125

6.07

5.04
(ADT 39)

20.2

Pant Sankar Dhan

1997

-

115-120

6.80

6.20
(Pant Dhan4)

9.7

PHB 71

1997

-

130-135

7.86

-

-

Sahayadr

1998

-

125-130

6.64

4.84
(Jaya)

35.8

Narendra Sankar Dhan 2

1998

-

125-130

6.15

4.94
(Sarjoo 52)

24.5

  • Out of these 13 hybrids, Tamilnadu has released 3 hybrids viz., CORH1 (MGR), CORH2 and ADTRH1.
  • The CORH1 (MGR) and ADTRH1 are early duration hybrids, CORH2 was a medium duration hybrid matures in 125 days.
  • Among the two early hybrids, ADTRH1 was found to be the best and doing very well in all the places it was cultivated.
  • It recorded an average yield of 6.4 tonnes/ha with an increased yield of 16.8 and 15.2% over CORH1 and ASD18 respectively. The grain is long slender with white rice.
  • It is moderately resistant to stemborer and leaf folder under field conditions and suitable for cultivation in Kar, Kuruvai and Sornavari seasons of Tamilnadu.
  • The medium duration hybrid CORH2 matures in 125 days and can be grown between July and October.
  • The average yield potential of this hybrid is 6.07 t/ha which is 20.2% increased yield over ADT 39.
  • The grain is medium slender with white rice.
  • This is moderately resistant to blast and WBPH.
  • It can also be cultivated in salt stress condition.
  • While ADTRH1 fits very well in Kar, Kuruvai and Sornavari seasons, the medium duration CORH2 rice hybrid is suitable for samba and thaladi seasons (August to October).

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Hybrid Varieties

Variety
Duration
Yield
Grain quality
 Remarks
ADTRH1
115
7.9
Long slender
White rice, mild aroma, resistant to stem borer and leaf folder
CORH1
110-115
5.9
Slender
-
CORH 2
130
6.1
Long slender white rice
Suited to saline alkaline soils also

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Tamilnadu

Rice

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