Central Rice Research Institute Annual report...2011-12

Breeding for Resistance/Tolerance to Biotic, Abiotic and Environmental Stresses
was about 6.0 t ha -1 . Total 60 kg groundnut, 50 kg sunflower,
2 kg watermelon and 2 kg okra seeds were distributed
to 150 farmers in Ersama, Astaranga and
Mahakalpada blocks for popularization of non-rice
crops.
Enabling Poor Rice Farmers to Improve
Livelihoods and Overcome Poverty in
South and Southeast Asia Through the
Consortium for Unfavorable Rice
Environments (CURE)
Identification of better sources of tolerance to
stagnant flooding
Seventy four advanced breeding lines received from
IRRI, Philippines along with two check varieties
(Swarna-Sub1 and Varshadhan) have been evaluated
in a cemented tank by maintaining the water level of
30-40 cm from 25 days after planting to dough stage
during wet season, 2011. None of the entries performed
better than the best check Varshadhan. However, among
the different entries viz., IR85085-SUB17-3-3-2, IR85078-
39-3-1-3, IR85041-SUB18-3-2-1, IR85078-42-2-2-2,
IR85078-14-1-2-1, IR49830-7-1-2-3, IR85083-SUB 1-1-2-
2, IR85042-SUB 3-3-2-3, IR85086-SUB 20-2-1-2 were
found promising and better than the Swarma-Sub1.
Seed and seedbed management for DS rice
The experiment was conducted with two cultivars
namely, Swarna and Swarna-Sub1 under direct seeding
condition with three different seed rates (60 kg ha 1 ,
90 kg ha 1 and 120 kg ha 1 ). Complete submergence for
15 days after 25 days of sowing resulted 67, 79 and 87
per cent survival in Swarna-Sub1 under 60 kg ha 1 , 90
kg ha 1 and 120 kg ha 1 seed rate, respectively. The survival
% was significantly greater under higher seed rate.
Survival percent was below 2 % in case of Swarna. From
the present findings higher seed rate (120 kg ha 1 ) was
found beneficial especially under submergence to realize
greater yield in Swarna. However, in the submergence
tolerant cultivar Swarna-Sub1 seed rate @ 60 kg
ha 1 found optimum either for control or submerged
conditions. Farmers’ can save up to 60 kg of seed materials
in cultivating Swarna-Sub1 compared to Swarna
with guarantee against damage of flooding.
Nursery management practices for TP Rice
The experiment was conducted with two rice cultivars
viz., Swarna and Swarna-Sub1. Seedlings were
raised under two seed rates (viz., 30 g m -2 and 50 g m -2 )
with three fertilizers doses (N:P:KH” 20:0:20; 20:20:20
and 20:40:20 kg ha -1 ). Twenty-five days old seedlings
were transplanted and after 10 days of transplanting
complete submergence under 80 cm depth of water was
given for 15 days. Survival percentage varied from 1 to
12 % and 57 to 73 % in Swarna and Swarna-Sub1, respectively.
In general, grain yield and yield attributing
parameters viz., straw yield and harvest index were
non-significant under different methods of crop rising
in seed bed. The present findings indicated that the
crop rising with different rates of seed and phosphorous
application at seed bed did not improve the
chances of survival under submergence as well as excess
grain yield under control condition.
CRRI ANNUAL REPORT 2011-12
59