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

1
) and CRR 536-7-1-1 (2.60 t ha -1 ) were the top yielding
entries in the trial, significantly superior to other entries
and checks (Table 6). Other promising entries identified
are CRR451-11-B-1 (2.29 t ha -1 ), CRR446-6-1 (2.08
t ha -1 ) and CRR635-3-2 (2.08 t ha -1 ).
Hybridization, selection and evaluation of breeding materials
Ten new cross combinations were attempted involving
parents viz., Sahbhagidhan, Sadabahar, RR51-1,
Annada, Abhishek, ARB7, TJP48, CT9993-5-10-1-M,
CR2340-11 and IR64-glaberrima introgression lines for
the improvement of drought tolerance, weed
competiveness and blast resistance besides yield potential
under favourable uplands. Segregating populations
of different generations were evaluated and selections
were made based on maturity duration, plant
height, panicle length, number of grains panicle -1 , sterility
percentage and disease, and pest reaction. During
2011 wet season, 1223 single plant progenies were
raised for evaluation under direct seeded condition. In
segregating generations, from F 3
to F 8
, 616 single plant
progenies were selected from 118 crosses for further
evaluation (Table 7). Besides these, 16 uniform progenies
were bulked for preliminary yield evaluation in
the next season.
Varietal improvement for shallow favourable
lowland and irrigated ecosystems
Development of varieties with wider adaptability
Out of sixty germplasm lines maintained and evaluated,
Shatabdi, a semi-dwarf, non-lodging early rice
cultivar and Phalguni were found promising for boro
condition. They were also found promising for Odisha
under direct seeded wet land condition. They are adaptive
to boro season with grain yield of 5.0- 6.0 t ha -1 in
110 days duration. WITA12 has been observed to possess
basal pigmentation and white panicle.
Two hundred and seventy three progenies (F 4
-F 7
)
along with checks, Swarna, Lalat, Naveen, WITA8 and
WITA12 were evaluated and 273 SSPs were selected.
Out of forty fixed cultures evaluated earlier, six were
multiplied and nominated for AICRIP trials. Out of 24
fixed (AICRIP Trials) cultures evaluated, CRK26-1,
Phalguni, CRAC2224-533, Satyakrishna and CRK22
found to be promising. Yield potential did not differ
under direct seeded and transplanted condition but duration
was early by 7-10 days under direct seeded condition.
Under direct seeded and transplanted conditions
elite cultures viz., CRAC2222-533, CRK22, CRK26-1-2-
1, WITA12, Lalat, Naveen, IR64, Phalguni and
Table 7. Single plant (SP) selections made for
favourable uplands during 2011 wet season
No. of No. of No. of No. of
Cross Progenies SP bulk
Generation grown selected selected
F 3
22 818 380
F 4
6 87 56
F 5
19 96 53
F 6
25 99 61
F 7
22 56 31
F 8
24 67 35 16
Total 118 1223 616 16
Satyakrishna were evaluated in both boro and wet seasons.
In both the seasons, duration of the varieties got
reduced by 7-10 days under direct seeded condition
with little difference in yield. In AYT for irrigated ecosystem,
30 advanced cultures were evaluated under two
replications along with checks Naveen, Lalat and IR
64. The promising cultures were CRK18, CRAC2222-
533, CRAC2221-43, CRAC2224-1041, CRK26-1-2-1 (IET
19351) and CRK26.
Development of Varieties with High
Nitrogen Use Efficiency
Evaluation of rice genotypes for high nitrogen
use efficiency
Thirty one rice genotypes were evaluated under irrigated
condition during dry season 2011 for nitrogen
use efficiency at N 0
, N 120
and N 200
level. Based on Agronomic
N use efficiency (AE N
) at moderate N level i.e.
120 kg ha -1 Birupa found to be most efficient with AE N
value of 24.4, followed by Tapaswini (23.8), Indira
(23.4), Surendra (22.6) and Pusa 44 (22.4). Almost similar
trend was observed when high dose of N (200 kg ha -
1
) was used. The most efficient genotypes at high N rate
were Tapaswini with AE N
of 18.4, Birupa (18.2), IR8
(17.6), Indira (17.2) and Pusa 44 (17.0). N 120
level, the
highest yield of 6.2 t ha -1 was recorded in Tapaswini
followed by Surendra (5.8 t ha -1 ), Indira (5.5 t ha -1 ) and
IR8 (5.4 t ha -1 ) whereas, N 200
level the highest yield was
obtained in Tapaswini (6.8 t ha -1 ) followed by IR8 (6.4 t
ha -1 ), Pusa 44 (6.3 t ha -1 ) and Indira (6.0 t ha -1 ).
Evaluation of performance of promising F 5
population in wet season 2011
Sixty promising F 5
populations were evaluated to
assess their performance at lower (N 40
) and moderate
24 CRRI ANNUAL REPORT 2011-12