Genotypic variation for nitrogen-use efficiency in rapeseed-mustard
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Authors
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PK Barua
Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785013, Assam, India
Author
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J Chutia
Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785013, Assam, India
Author
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P Borah
Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785013, Assam, India
Author
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M Barua
Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat 785013, Assam, India
Author
Keywords:
Genotypes, nitrogen-use efficiency, rapeseed-mustard, yield traitsAbstract
Genetic variation for nitrogen-use efficiency (NUE) and related yield traits were assessed in 11 toria (Brassica rapa var.
toria), 14 yellow sarson (Brassica rapa var. yellow sarson) and 7 Indian mustard (Brassica juncea) genotypes. These
genotypes were evaluated at 0 and 40 kg N ha-1 levels of nitrogen fertilization and, nitrogen-use efficiency (NUE) in
terms of agronomic efficiency was determined. Significant genetic variation was observed for all the traits studied. A
toria genotype TS65 produced the highest yield (9.92 q/ha) coupled with the highest NUE (17.5 kg kg-1). High
heritability was recorded for leaf nitrogen, 1000-seed weight, nitrate reductase activity (NRA), days to maturity, siliquae
per plant and seeds per siliqua. High genetic advance was recorded for siliquae number per plant, NRA, seeds per siliqua
and leaf N. There was strong positive genetic correlation between seed yield and NUE, indicating the significance of
enhanced NUE for seed yield improvement.
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