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Question : Whether chaffiness in hybrid rice can be reduced?
Answer :

Yes. Chaffiness in hybrids can be reduced to some extent by better management, adequate and timely supply of nutrients and water and ensuring that flowering does not coincide with extremely high or low temperatures.

Question : What is the recommended package for hybrid rice seed production?
Answer :

 The recommended package for hybrid seed production is as follows.

 
Activity
Particulars

Isolation distance

100 m. for hybrid seed production 500 m. for CMS multiplication

Seed rate

“A” line or female Parent : 15 kg/ha “B” or “R” line or male parent : 5 kg/ha

Nursery

Sparse seeding (15-20 g/m2) to ensure multi-tillered (4-5) seedlings in 25 days

Row ratio

2B: 8A for CMS multiplication
2R : 10 A for hybrid seed production

Number of seedlings/hill
2    seedlings/hill for female parent
3    seedlings/hill for male parent

Spacing

Male : Male = 30 cm Male : Female = 20 cm Female : Female = 15 cm Plant : Plant = 15 cm or 10 cm

GA3 application

60-90 g/ha in 500 litres of water at 5-10% heading in two split doses on consecutive days

Supplementary pollination

Four to Five times a day at peak anthesis with 30 minutes interval during flowering phase

Roguing
    At vegetative phase   -
    At flowering           -
    At maturity        -

Based on morphological
characters of leaf and
plant type Based on panicle characteristics Based on grain characteristics and percent seed set.

Seed yield

1.5 – 2.5 t/ha.
Question : How much is the average yield advantage and net profit per hectare by cultivation of hybrids?
Answer :

 Based on the large number of demonstrations conducted in the farmers' fields during the last six years, the average yield advantage realized by the farmers over the high yielding check varieties of the regions ranged from 1.0 — 1.5 t/ha. The net profit to the farmer by cultivation of hybrids as compared to the high yielding varieties of the region ranged from Rs. 3500/- to Rs. 6000/- per hectare.

 

Question : Whether rice hybrids are suitable for direct seeding?
Answer :

 At present, hybrids are not recommended for direct seeding as it requires high seed rate. Seed cost being very high, cultivation of hybrids becomes uneconomical, under direct seeded conditions.

 

Question : Whether hybrids perform better under limited water conditions?
Answer :

 Yes, generally hybrids do perform better under limited water conditions. For example, Sorghum hybrids became popular in India after their introduction due to their better performance during the drought years of mid sixties. Several such instances of better performance of hybrids under moisture stress situations have been reported in other crops. During the severe drought year of 2002, rice hybrids were reported to have performed better in Uttar Pradesh and Bihar under limited water conditions, which paved way for their popularity and large scale adoption in subsequent years.

 

Question : Which herbicides can be used for controlling weeds in transplanted paddy?
Answer :
  • Pyrazosulfuron ethyl 10 % -250g / ha, mixed with 30 kg of sand or 500 lit of water and applied 3 - 5 days after transplanting. or
  • Pretilachlor 50 EC - 1.5 lit / ha, mixed with 30 kg of sand or 500 lit of water and applied 3 - 5 days after transplanting. or
  • Butachlor 5 % - 30 kg / ha, mixed with 30 kg of sand or 500 lit of water and applied 3 - 5 days after transplanting.
  • Bensulfuron methyl + Pretilachlor (6.69) - 10 Kg / ha, mixed with 30 kg of sand or 500 lit of water and applied 3 - 5 days after transplanting. 
 
Question : Whether hybrids are suitable for all rice growing areas?
Answer :

No, hybrids are not suitable for all the rice growing areas. The presently released hybrids have been specifically developed for high yielding irrigated areas. However, they have also been found suitable for favourable shallow lowlands. The present hybrids are not suitable for uplands, deep water, submerged conditions etc.

 

Question : List the high yielding varieties of medium duration?
Answer :

 HKR 127, HKR 126, HKR 120, PR 106 and Jaya

 

Question : Whether hybrids can be cultivated in both kharif and rabi seasons ?
Answer :

Yes. Most of the hybrids presently available are of early to medium duration which can be cultivated successfully both in kharif (wet season) and rabi (dry season).

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