Abstract:
Salinity is one of the most destructive factors
among the abiotic stresses, which limit the crop
production considerably and ability of salt tolerance
among the genotypes of a species may be varied.
Appropriate nutrients application on salinity condi tion may alleviate its harmful effects. To achieve
the aforementioned objectives, two pot experiments
were performed to find out salt tolerant mungbean
genotype (s) and to alleviate salinity stress through
nutrient management. Eleven mungbean genotypes
viz. BARI mung 2, BARI mung 3, BARI mung 4,
BARI mung 5, BARI mung 6, BINA moog 1,
BINA moog 2, BINA moog 5, BINA moog 6,
BINA moog 7 and BINA moog 8 were screened out
in three salinity levels (0, 75 and 125 mM) of NaCl.
The germination of all mungbean genotypes was
delayed and germination percentage was reduced
with increasing level of salinity. Among the varie ties, BINA moog 8 showed the best performances
in terms germination and seedling growth (length,
fresh and dry weights of shoot and root) and BARI
mung 2 showed the least performances under saline
environment. The results revealed that BINA moog
8 was the most tolerant and BARI mung 2 was the
most sensitive genotype. BINA moog 8 was also
used for alleviation of salinity through potassium
nitrate (KNO3) application under five salinity lev els (Control, 50mM salt, 50 mM salt + 10 mM
KNO3, 50 mM salt + 20 mM KNO3 and 50 mM
salt + 30 mM KNO3). Plants treated with 30 mM
KNO3 under 50 mM salt stress produced the best
growth and yield contributing characters viz. length
of stem and root, no of branches plant-1, fresh and
dry weight of leaf, stem and root, pods plant-1,
seeds pod-1, 1000 seed weight performed better
level while the least performance in respect of
above traits were observed without KNO3 without
stressful conditions (50 mM NaCl). Therefore,
BINA moog 8 can be grown successfully at mild
stress (50 mM NaCl) with application of 30 mM
KNO3.
