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spp. isolated from saline habitat of Bangladesh. the population was less ranging from 17.3 × l0
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Bang. J. Life Sci., 2007, 19 (2), 55-60. to 58.6 × l0 cfu/g. Highest number of bacteria
was found in the root samples and the least in
The respiratory activity and nitrogen fixing non-rhizosphere soil samples. In case of all
potential of five strains of Azospirillum lipoferum, samples the Azospirillum population ranged from
three strains ot Azospirillum brasilense, three 0.l × l0 to 24.6 × l0 MPN/g dry wt. and 0.l × l0
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strains of Azospirillum halopraeferens and one to 14.4 × l0 MPN/g dry wt. in saline medium
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strain of Azospirillum amazonense isolated from (semi-solid Nfb + 3% NaCl) and normal medium
saline habitat in the district Satkhira, Bangladesh (semi-solid Nfb without extra NaCl)
were studied. The salt, NaCl has shown definite respectively. Root samples harboured highest
effect on the respiratory activity and nitrogen population of Azospirillum and non-rhizosphere
fixing potential of the selected strains of soil samples showed the least.
Azospirillum spp. The activity and the rate of
nitrogen fixation of the strains MR-1, MR-3, MR- 354 SOLAIMAN, A. R. M. & RABBANI, M.
4, MR-8 and MR-11 were found maximum at 3% G. (Dept. of Soil Science, Bangabandhu Sheikh
NaCl. The other strains MR-5, MR-6, MR-7, MR- Mujibur Rahman Agricultural University, Salna,
13, MR-14, MR-15 and MR-16 showed highest Gazipur). Effects of Rhizobium Inoculant,
nitrogen fixation and respiratory activity at 5% Compost and Nitrogen on Edible-Podded Pea.
NaCl. Among the strains, MR-7, MR-13 and MR- Bang. J. Microbiol,. 2005, 22 (1), 5-9.
16 strains were comparatively more efficient in The effects of Rhizobium inoculant, compost and
nitrogen fixing ability and respiratory activity nitrogen (N) on nodiilation, growth, dry matter
under stressed condition due to salinity. production, yield attributes and yield of edible-
podded pea (Pisum sativum) var. macrocarpon
353 RAHMAN, M.M.; MUBASSARA, S.; were assessed by a field experiment. Among the
KHAN, Z.U.M. (Dept. of Botany, Jahangirnagar
treatments Rhizobium inoculant alone performed
University, Savar, Dhaka) & HOQUE, S. (Dept. of best in recording number and dry weight of
Soil, Water & Environment, Dhaka University, nodules per plant. The highest green pod yield of
Dhaka). Aerobic heterotrophic bacteria and 11.88 t/ha (153% increase over control) and mature
Azospirillum in certain saline soils of Bangladesh. seed yield of 1.84 t/ha (127% increase over
Bang. J. Life Sci., 2006, 18 (1), 105-110. control) were obtained by the application of 150 kg
N/ha. The effect of 100 kg N/ha was similar to the
The population of aerobic heterotrophic bacteria effect of 150 kg N/ha in recording plant height,
and microaerophilic diazotroph Azospirillum root length, dry weight of shoot, number of
occurring in the saline habitat of a saline prone pods/plant, number of mature seeds/pod, 1,000-
zone of Satkhira district, Bangladesh was seed weight, green pod yield and mature seed yield
studied. These organisms were found to occur in of edible podded pea. Further, the effect of
the saline non-rhizosphere soil, and also in the Rhizobium inoculant alone was comparable to the
root and rhizosphere soil of Cynodon dactylon. effect of 100 kg N/ha in most of the parameters of
The total aerobic heterotrophic bacteria in root the crop studied.
samples in control medium (nutrient agar) varied
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from 31.2 × l0 to 67.2 × l0 cfu/g but in saline 632 : AGRICULTURE : PLANT
medium (nutrient agar with 3% additional NaCl)
INJURIES, DISEASES, PESTS
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