|
in
| Title : |
Performance of rice genotypes under drought stress conditions during rice growing season of 2011-2012 |
| Material Type: |
printed text |
| Authors: |
Mishra, K.K., Editor ; A Kunwar, Editor |
| Pagination: |
29-4 p. |
| Languages : |
English (eng) |
| Keywords: |
Drought stress ; advance yield trial rainy season |
| Abstract: |
Drought is the major constraint to rice production in rainfed areas of Nepal. In the context
of current and predicted water scarcity, increasing irrigation is generally not a viable option
for alleviating drought problems in rain fed rice-growing systems. It is therefore critical that
genetic management strategies for drought focus on maximum extraction of available soil
moisture and its efficient use in crop establishment and growth to maximize biomass and
yield. Extensive genetic variation for drou~t resistance exists in rice germplasm.
Eexperiments were conducted during rainy seasons of 2011 and 2012 at Regional
Agriculture Research Station, Nepalgunj. A total of 400 genotypes were evaluated in five
different varietal trials for drought tolerance under the project Stress Tolerant Rice for poor
farmers in Africa and South Asia Genotype IR 83873-B-B-47-4 produced highest grain
yield of 4356 kglha followed by IR 83372~B-B-94-4 (4323 kglha) and (4165 kglha),
respectively, in Advance Yield Trial100-120 RS, where local check Sabitri produced only
2737 kglha. An overall reduction in yield among genotypes provided with reproductive
stress was recorded as 3 I .82% compared to the fully irrigated trials, indicating intensity of
stress was moderate. In Advance Yield Trial Greater Than 120 RS (A YTGT120),1R
70210-39-CPA-7-1-1-4-2 had highest grain yield (3924kg/ha) followed by IR 78875-207-
B-3-B(3906 kglha.) and IR 80312-6-B-3-2-B (3854 kglha) respectively, where as standard
check Sabitri produced (1736 kglha). Under reproductive stress condition, the overall
reduction in yield (RYR) was 37.61% compared to the fully irrigated trials, which imply
that intensity of stress was moderate. In DONER RS, CIDCKEN SHONI was found as
highest yielder (3396 kg /ha) followed by CO 19 (3229 kglha), SLO 16 (3229
kglha),respectively. Under RS condition RYR was 28.84. Likewise, in IR64 NILSRS, IR
87707-446-B-B-B produced highest grain yield (3433 kglha) followed by IR 87707-445-BB-
B (3300 kglha) and IR 87706-215-B-B-B (2985 kglha) respectively, where as IR 64
produced 1600 kglha. Under reproductive stress condition, the overall reduction in yield
was recorded as 42.09% compared to the fully irrigated trials. Similarly, in
OBSERVATION YIELD TRIAL RS, IR 87760-15-2-3-4 produced highest grain yield
(4667 kglha) followed by IR 87761-60-2-4-2 (4217 kglha) and IR 87638-10-1-1-2 (4125
kglha) respectively.The entries which had yield more than 3500 kg per ha were selected for
AYT. All most all those selected genotypes came under 100-120 days maturity group.
Under reproductive stress condition, the overall reduction in yield (RYR) was 40%
compared to the fully irrigated trials, which imply that intensity of stress was moderate. |
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=927 |
in
Performance of rice genotypes under drought stress conditions during rice growing season of 2011-2012 [printed text] / Mishra, K.K., Editor ; A Kunwar, Editor . - [s.d.] . - 29-4 p. Languages : English ( eng) | Keywords: |
Drought stress ; advance yield trial rainy season |
| Abstract: |
Drought is the major constraint to rice production in rainfed areas of Nepal. In the context
of current and predicted water scarcity, increasing irrigation is generally not a viable option
for alleviating drought problems in rain fed rice-growing systems. It is therefore critical that
genetic management strategies for drought focus on maximum extraction of available soil
moisture and its efficient use in crop establishment and growth to maximize biomass and
yield. Extensive genetic variation for drou~t resistance exists in rice germplasm.
Eexperiments were conducted during rainy seasons of 2011 and 2012 at Regional
Agriculture Research Station, Nepalgunj. A total of 400 genotypes were evaluated in five
different varietal trials for drought tolerance under the project Stress Tolerant Rice for poor
farmers in Africa and South Asia Genotype IR 83873-B-B-47-4 produced highest grain
yield of 4356 kglha followed by IR 83372~B-B-94-4 (4323 kglha) and (4165 kglha),
respectively, in Advance Yield Trial100-120 RS, where local check Sabitri produced only
2737 kglha. An overall reduction in yield among genotypes provided with reproductive
stress was recorded as 3 I .82% compared to the fully irrigated trials, indicating intensity of
stress was moderate. In Advance Yield Trial Greater Than 120 RS (A YTGT120),1R
70210-39-CPA-7-1-1-4-2 had highest grain yield (3924kg/ha) followed by IR 78875-207-
B-3-B(3906 kglha.) and IR 80312-6-B-3-2-B (3854 kglha) respectively, where as standard
check Sabitri produced (1736 kglha). Under reproductive stress condition, the overall
reduction in yield (RYR) was 37.61% compared to the fully irrigated trials, which imply
that intensity of stress was moderate. In DONER RS, CIDCKEN SHONI was found as
highest yielder (3396 kg /ha) followed by CO 19 (3229 kglha), SLO 16 (3229
kglha),respectively. Under RS condition RYR was 28.84. Likewise, in IR64 NILSRS, IR
87707-446-B-B-B produced highest grain yield (3433 kglha) followed by IR 87707-445-BB-
B (3300 kglha) and IR 87706-215-B-B-B (2985 kglha) respectively, where as IR 64
produced 1600 kglha. Under reproductive stress condition, the overall reduction in yield
was recorded as 42.09% compared to the fully irrigated trials. Similarly, in
OBSERVATION YIELD TRIAL RS, IR 87760-15-2-3-4 produced highest grain yield
(4667 kglha) followed by IR 87761-60-2-4-2 (4217 kglha) and IR 87638-10-1-1-2 (4125
kglha) respectively.The entries which had yield more than 3500 kg per ha were selected for
AYT. All most all those selected genotypes came under 100-120 days maturity group.
Under reproductive stress condition, the overall reduction in yield (RYR) was 40%
compared to the fully irrigated trials, which imply that intensity of stress was moderate. |
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=927 |
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