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Contents Foreword
The rice seed
- The rice plant
- The seed and the grain
- Parts of a seed
Reproductive parts of the rice plant
- The spikelet
- Process of seed formation
- Stages of seed formation
- Inbred rice seed
- Hybrid rice seed
Hybrid rice parental lines
- Male sterile line
- Maintainer line
- Restorer line
Desirable characteristics of parental lines
- Desirable characteristics of the CMS line
- Desirable characteristics of maintainer and restorer lines
- Choice of parents for hybrid seed production
Seeding of parental lines in the seedbed
- Why seed in the seedbed
- Seedbed preparation
- Pregerminating seeds
- Managing the seedbed
Synchronization of flowering
- Differential seeding
- How to determine seeding time of A and R lines
Differential seeding times
Differential seeding times for hybrid seed production
- Seed parent has 10-day shorter growth duration than pollen parent
- Seed parent has 10-day longer growth duration than pollen parent
- Seed parent has same growth duration as pollen parent
- Differential seeding times for CMS multiplication
Selection of CMS multiplication and hybrid seed
production fields
- Requirements
- Distance isolation
- Time isolation
- Barrier isolation
Transplanting
- Why transplant
- How to transplant
- How many seedlings per hill
- Layout for transplanting
- Seedling age at transplanting
Transplanting in a specific row ratio
- What is a row ratio
- Factors influencing row ratio
- Characteristics of the R line
- Characteristics of the A line
- Flowering behavior of the A and R lines
Transplanting sequence for CMS
multiplication
- Transplanting A line
- Trsnsplanting B line
Transplanting sequence for hybrid
seed production
- Seed parent has 10-day shorter growth duration than pollen parent
- Transplanting the R line
- Transplanting the A line
- Seed parent has 10-day longer growth duration than pollen parent
- Transplanting the A line
- Transplanting the R line
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- Seed parent has same growth duration as pollen parent
- Transplanting the R line
- Transplanting the A line
Seeding and transplanting
modifications to increase seed yield
- Change the seedling proportion of R line
- Seed the R line twice
- Modify row ratios
- Modify row and plant spacings
- Transplant R line seedlings on the same day
Management of seed production plots
- Retransplant missing hills
- Control weeds
- Control diseases and insect-pests
- Fertilizer management
Adjusting flowering Date
- Synchronization of flowering date of parental lines
- Panicle initiation and flowering date
- How to observe panicle initiation
- Development stages of panicle formation to flowering
- Estimating flowering date by panicle primordium stage
- How to adjust flowering date of parental lines showing 5-6 days difference
- How to adjust flowering date of parental lines showing a difference of more than a week
Flag leaf cutting
- Crop stage for flag leaf clipping
- Flag leaf clipping method
Gibberellic acid application
- Why spray gibberellic acid
- Timing of application-crop growth stage
- Timing of application-weather conditions
- How to make GA3 solution general procedure
- How to make GA3 solution amount required for different size plots
- How to make GA3 solutiondoing your own computations
Supplementary pollination
- Methods of supplementary pollination
- Timing of supplementary pollination
Roguing
- What is roguing and why is it necessary
- Crop stage for roguing
- At maximum tillering
- At flowering
- Before harvest
Harvesting
- Special considerations for harvesting hybrid rice
- When to harvest
- Harvesting the B or R line
- Harvesting the A line
Threshing
- Preparation for threshing
- Threshing the seed parent
- Threshing the pollen parent
Seed drying
- Why seed drying
- Seed drying methods-sun drying
- Seed drying methods-forced air drying
Processing hybrid rice seed for market
- Cleaning and grading
- Seed germination testing
- Packing and labeling the seed
Citation
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