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Hybrid Rice Seed Production Techniques (HRSPT)

13
Jul

Roguing at flowering

 

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
Photo Courtesy: 
ZARS Mandya
13
Jul

Roguing at maximum tillering

 

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
Photo Courtesy: 
Dr.RM Kumar (DRR)
13
Jul

Roguing

 

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
Photo Courtesy: 
RARS Karjat
13
Jul

How to adjust flowering date of parental lines showing a difference of more than a week

Remove the panicles from the main tiller of the seed parent.

1.Spray 2% urea and also add nitrogenous fertilizer to the seed parent only to make unproductive, late tillers bear productive panicles and achieve synchronization of flowering.

2.Advance the flowering date of the pollen parent by spraying 1% solution of phosphate fertilizer immediately after observing the panicle development stage in the pollen parent, or by keeping water standing in the field.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/How_to_adjust_flowering_date_of_parental_lines_showing_a_difference_of_more_than_a_week.htm
13
Jul

How to adjust flowering date of parental lines showing 5-6 days difference

1.Delay the flowering date of the seed parent by spraying quick releasing nitrogen fertilizer (urea 2% concentration) immediately after observing that the panicle in the seed parent is at stage III.

2.Advance the flowering date of the pollen parent by spraying 1% solution of phosphate fertilizer immediately after observing the panicle development stage in the pollen parent, or keep water standing in the field.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/How_to_adjust_flowering_date_of_parental_lines_showing_5-6_days_difference.htm
13
Jul

Estimating flowering date by panicle primordium stage

 

Estimating flowering date by panicle primordium stages

1.For complete flowering synchronization, the pollen parent should be one stage earlier than the seed parent during stages I, II, and III of panicle development.

2.Both parents should be in the same stage during the 4 middle stages IV, V, VI, and VII.

3.The seed parent should be slightly earlier than the pollen parent during VIII, IX, and Xth stages of panicle development

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Estimating_flowering_date_by_panicle_primordium_stage.htm
Photo Courtesy: 
http://www.knowledgebank.irri.org/extension/index.php/hybridriceadjusting-flowering-date/hybridricesynchronization-of-flowering-date-of-parental-lines
13
Jul

How to observe panicle initiation

1. Select the longest growing tiller (main tiller) and cut it at the base where stem and root join.

 

2. Slit the stem lengthwise from the base up to the top of the tiller.  .

 

3. Open the slit immediately above the nodal portion.

 

4. Observe the developing panicle (preferably with a magnifying lens). It is about 1 mm long.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/How_to_observe_panicle_initiation.htm
13
Jul

Panicle initiation and flowering date

Panicle initiation and flowering date

1. Flowering date is predicted on the basis of panicle initiation.

2. Panicle initiation begins at maximum tillering in all rice cultivars.

3. Flowering commence in all cultivars about 30 days after panicle initiation.

4. The young panicle (panicle primordium) becomes visible (with a magnifying lens) within 40-45 days of sowing in cultivars maturing in 95-100 days.

                50-52 days of sowing in cultivars maturing in 105-110 days.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Panicle_initiation_and_flowering_date.htm
13
Jul

Synchronization of flowering date of parental lines

1. Synchronize flowering of parental lines by differential sowing.

 

2. Weather fluctuations during the growing season and crop management practices may cause the parental lines to commence flower on different dates.

 

3. When flowering is not synchronized, hybrid seed yield will be reduced.

 

4. Flowering date of parental lines cannot be accurately predicted until the crop is at maximum tillering stage.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Synchronization_of_flowering_date_of_parental_lines.htm
13
Jul

Adjusting Flowering Date

1. If the difference in predicted flowering is more than 3 days between the parental lines, measures should be taken to synchronize flowering.

2. The application of quick-releasing N fertilizers on an early-developing parent in the early panicle development stages tends to delay flowering.

3. Similarly, spraying phosphatic solution (1%) on the later-flowering parent tends to enhance flowering by 2-3 days.

File Courtesy: 
http://www.fao.org/docrep/006/y4751e/y4751e0j.htm#TopOfPage
13
Jul

Fertilizer management

 

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Fertilizer_management.htm
Photo Courtesy: 
Dr. R. M. Kumar (DRR)
13
Jul

Water management

 

File Courtesy: 
Regional Agricultural Research Station , Karjat
Photo Courtesy: 
Regional Agricultural Research Station , Karjat
12
Jul

Nutrient management

1. Use integrated nutrient management approach to ensure higher hybrid rice seed production. The principle is that maximum fertilizer should be applied up to tillering stage (70 –80%) and small portion of fertilizer should be applied at later stages.

2. Apply 10 t/ha FYM in the field before puddling. Jiang et al., (1993) also reported that the application of organic manure @ 10 – 15 t/ha (fresh weight) before ploughing or puddling in addition to inorganic N, P & K is effective.

File Courtesy: 
Regional Agricultural Research Station , Karjat
12
Jul

Control of diseases and insect-pests

 

1. Keep diseases and insect pests under complete control. 2. Follow insect and disease control practices recommended for your area.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Control_diseases_and_insect-pests.htm
Photo Courtesy: 
CRRI
12
Jul

Weed Control

 

Keep the weeds under complete control.

Weeds can be controlled by

1. Hand weeding\ Hand pulling

2. Mechanical means such as weeders (e g. Cono weeder).

3. Herbicides.

File Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Control_weeds.htm
Photo Courtesy: 
http://www.knowledgebank.irri.org/hybridriceseed/Control_weeds.htm
12
Jul

Gap filling of missing hills

 

1. Keep the field saturated until the plants recover in 4 or 5 days.

2. Then increase the water level to 5 cm.

3. Replant all the missing hills within 7 days of transplanting.

4. Be careful not to mix A and R seedlings when you replant missing hills.

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
Photo Courtesy: 
RM Kumar
12
Jul

Management of Seed Production Plots

Management of Seed Production Plots include retransplanting of missing hills (gap filling), control weeds, control of insect pest and diseases, nutrient management, water management and fertilizer management

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
11
Jul

Seed parent (A line) has same growth duration as pollen parent (R line)

 

1. The planting of both R and A lines can be done simultaneously.

2. First complete the A line plantings with 25 day old seedlings followed by R line plantings with the seedlings ages of 21day old first R line, 25 days old second R line and 29days old third R line.

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
Photo Courtesy: 
CONTENT SOURCE/HYPERLINK Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual Photo courtesy AGRO TECHNIQUES FOR HYBRID RICE CULTIVATION AND SEED PRODUCTION - 2005, DRR TRAINING MANUAL
11
Jul

Seed parent (A line) has 10 day shorter growth duration than pollen parent (R line):

 

1. The seedlings of the R line are transplanted when the seedlings from the second R line sowing are 25 days old.

2. At this time the age of seedlings from the first R line sowing will be 21 days old and the age of the seedlings from the third R line sowing will be 29 days old.

3. Later transplant 25 days old seedlings of the A line 10 days later than the second R line seedlings.

File Courtesy: 
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual
Photo Courtesy: 
CONTENT SOURCE/HYPERLINK Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual Photo courtesy Agro techniques for hybrid rice cultivation and seed production - 2005, DRR training manual
11
Jul

Seed parent (A line) has 10 day longer growth duration than pollen parent (R line):

1. Transplant 25 day old seedlings of the `A’ line, 10 days earlier than the second `R’ line seedlings.

2. The seedlings of the R line are transplanted when the seedlings from the second R line sowing are 25 days old.

3. At this time the age of seedlings from the first R line sowing will be 21 days old and the age of seedlings from third R line sowing will be 29 days old.

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