18 Questions
What is one way to maintain the genetic purity of established varieties according to the text?
Growing in isolated pots
In bulk selection for improving genetic purity, how many off-types or dissimilar plants should lead to the discard of a plot?
39
What method is preferred for maintaining nucleus seed of inbred lines to avoid reducing vigor?
Hand pollination
Why is maintenance of varieties of cross-pollinated crops more complicated than self-pollinated crops?
Due to the complexities of maintaining genetic purity
Which breeding practice involves self pollination, sib pollination, or a combination of both?
Nucleus seed maintenance
Why is maintenance by sibbing preferred over selfing when maintaining nucleus seed of inbred lines?
It avoids reduction in vigor
What is the recommended practice to maintain breeder stock seed of established varieties?
Store the breeder stock seed in old gunny bags.
What is the purpose of roughing before flowering in the context of maintaining breeder stock seed?
To maintain the purity of the seed lot.
Why is it important to have sufficient spacing between and within the rows when growing breeder stock seed?
To allow for removal of off-types and examination of individual plants.
What step should be taken when harvesting breeder stock seed to ensure purity?
Ensure the equipment used is clean.
In what condition should the equipment used for harvesting, threshing, and cleaning breeder stock seed be?
Clean to avoid contamination.
Why is it recommended to isolate the field when sowing breeder stock seed?
To prevent spread of diseases and natural crossing.
When should major rouging be done during the paddy cultivation process?
Before flowering
What is the recommended seed rate for paddy cultivation per hectare?
30-40 kgs/ha
During which stage of seed production is it desirable to grow paddy under the transplanting system?
For seed production
At what stage should rouging of offtypes be done in the paddy field?
Before flowering, at flowering, and maturity stages
How many field inspections are recommended between flowering and harvesting during paddy cultivation?
Two
What is the recommended spacing for medium and late duration variety paddy plants?
20x20 cm
Test your knowledge on the maintenance practices for breeder stock seeds, including proper sowing, field isolation, disease prevention, and farm practices. Learn important guidelines for storing and using breeder stock seeds for the next planting season.
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