Abstract
Correction: On 4th June 2021 the name of the third author was changed from 'Jivan' to 'Jiban'.
 The coordinated and regional varietal trial of normal season irrigated rice was carried out at Regional Agricultural Research Station (RARS), Tarahara, Nepal in 2014 & 2015. Out of the tested genotypes, NR 2157-166-1-3-5-1, Cieharang and NR 2157-166-2-1-1-1 identified as promising with potential grain yield of 4313, 4290 and 4239 kg/ha respectively in over year analysis (2014-15) under coordinated varietal trial (CVT). These genotypes recorded 25 to 27 percent higher grain yield than national rice productivity and 4 to 6 percent more than check variety, Sabitri. The differences in grain yield among the tested genotypes and between the years were found significant, but interaction of genotypes to year was found non-significant. Similarly, KARAJAT-3 recorded the highest grain yield (4897 kg/ha) followed by NR 1190-24-4-2-2-2-3-2 (4861 kg/ha) in over year analysis (2014-15) of regional varietal trial (RVT), similarly, identified as promising genotypes. These promising genotypes recorded 43 and 8 percent higher grain yield than national rice yield and to the check variety, Sabitri, respectively in over year analysis. The differences in grain yield among genotypes and year were found significant whereas it was non-significant for interaction of genotypes and to the tested years.
 Int J Appl Sci Biotechnol, Vol 4(4): 489-497
Highlights
Rice (Oryza sativa L) is the major staple cereal crops of the country
About 68 percent rice cultivated area and 70 percent rice production is contributed by Terai region (MOAD, 2014)
Total 24 genotypes namely, IR05N-304, NR 2158-13-1-12-4, IR 73718-26-12-5, IR 94391-131-358-19-B-1-1-1, IR 80285-34-3-3-2, NR 2157-66-2-3-1-1-1, IR 96321-1099-227-B-3-1-3, CIEHARANG SUB-1, IR 78875-207-B-B-B, IR 79584-382-1-4, IR 87377-B-B-93-3, IR10A277, NR 2157-32-2-1-11-1, CT 19151-7-5-125R-1P, ZR 2167-48-5-1-2-1-1, IR 79525-20-2-2-2, NR 2157-166-1-3-5-1, IR 96322-34-202B-2-1-2, NR 2158-13-1-2-4-1, NR 2157-166-2-1-1-1, NR 2157-144-1-3-1-1, SABITRI, IR 96321-558-64-B-4-1-1 and NR 2167-41-1-1-3-1 were included in the coordinated varietal trial (CVT) of 2015
Summary
Rice (Oryza sativa L) is the major staple cereal crops of the country. It occupies 42.72 percent area (1.49 million hectares) of the total cultivated area of the cereal crops (3.48 million hectares) and about 53 percent production (5.048 million tons) of the total production (9.56 million tons) of the cereal crops of the country. The average rice productivity of the nation is 3394 kg/ha whereas it is 3586 kg/ha for eastern Terai region (MOAD, 2014). Rice cultivated area and production of the country is dominated by Terai region. About 68 percent rice cultivated area and 70 percent rice production is contributed by Terai region (MOAD, 2014). About 70 percent of the total rice is produced for household consumption (Ghimire et al, 2013)
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