IDENTIFICATION OF MORPHO-PHYSIOLOGICAL TRAITS OF INDIAN MUSTARD (Brassica juncea) GENOTYPES IN RESPONSE TO NITROGEN APPLICATION
Loading...
Files
Date
2014
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
The present investigation was carried out on a set of forty-eight genotypes of
Brassica juncea to assess the effect of nitrogen on physiological, growth and yield traits
during two crop seasons. Leaf area revealed variability in the light harvesting capacity of
genotypes manifested in terms of LAI, chlorophyll, PAR interception which were reduced
under N-stress. During crop growth and development, chlorophyll content and LAI was
highest at 90 DAS and PAR interception at 60 DAS. Under unfertilized conditions(N0)
photochemical efficiency was much lower (0.677-0.744 mean 0.706) indicating more damage
to PSII whereas higher values (0.708-0.775 mean 0.735) indicated only minor photoinhibition
with fertilization. Improvement in photochemical efficiency (Fv/Fm) was 3.9%, photosystem
activity (Fv/Fo) 13.3%, ETR 45.9% and root length 28.1% with fertilization(N100). Growth
and yield attributes improved significantly with N. With N0 cultivars PBR-357, JT-152-1 and
ELM-151 and with N100 JT-152-1, MLM-19, NPJ-79 and PBR-357 recorded highest seed
yield. Yield improvements was less than 10% in MCP-632, PBR-357, JT-152-1 and ELM-
151 and were rated as promising/N-efficient genotypes. Oil content decreased while protein
content increased significantly with fertilization. An increase of 20.4% in oil yield and 25.9%
in protein yield was recorded with N100. Positive correlation existed between oil content and
protein yield (r=0.630*) under N-deficient and with fertilization (r=0.612*). N uptake
enhanced by 27.2% and had strong positive correlation with seed yield under N-deficient
(r=0.988**) and fertilization (r=0.989**). Eruric acid ˂ 2% was found in cultivars K-109-
113, EC-564646, ELM-303, JM-06026, EKLA and JC-1359-23-558 which is a desirable
quality trait.
Description
Keywords
null