论文信息 - QUANTIFICATION AND NITROGEN FIXATION OF CYANOBACTERIA IN RICE FIELD SOILS OF BANGLADESH

QUANTIFICATION AND NITROGEN FIXATION OF CYANOBACTERIA IN RICE FIELD SOILS OF BANGLADESH

Quantification of cyanobacterial population and nitrogen fixation of 18 heterocystous cyanobacteria isolated from rice fields soils of 11 districts of Bangladesh have been studied. The taxa recorded were, namely Nostoc linckia, N. carneum, N. ellipsosporum, N. piscinale, Anabaena oryzae, Scytonema mirabile, Calothrix marchica and Hapalosiphon welwetschii. The number of cyanobacterial population varied significantly ranging from 14.6 × 10 to 141.0 × 10/g soil. N2-fixation of Nostoc linckia isolated from rice fields of Dhaka and Brahmanbaria ranged from 1.84 to 8.13 mg N 50/ml. However, the potentiality of other species was more or less similar. Single correlation study suggests that quantitative variation in cyanobacterial population was significantly related positively to soil reaction, available P and available S and negatively to total N content of soil. However, multiple correlations reflects that variation of cyanobacterial population was due to cumulative contribution of all the variables.

[1] M. Gafur,et al. DISTRIBUTION OF BLUE-GREEN ALGAE IN SOILS OF CHITTAGONG UNIVERSITY CAMPUS AND THEIR NITROGEN FIXING CAPACITY , 2008 .

[2] P. Francis,et al. Ecology of deepwater rice-fields in Bangladesh 1. Physical and chemical environment , 1988, Hydrobiologia.

[3] Z. Begum,et al. Nitrogen fixing capacity of some cyanobacterial strains from Bangladesh , 1997 .

[4] Z. Khan,et al. N2-Fixing Blue-green algae in rice fields and and their relationship with soil fertility , 1993 .

[5] Z. Begum,et al. Residual effect of blue-green algae on the growth and yields of rice. , 1990 .

[6] Hashem,et al. Effect of blue green algae as biofertilizer on rice [Bangladesh] , 1984 .

[7] N. M. Scott. Evaluation of sulphate status of soils by plant and soil tests , 1981 .

[8] M. Araragi,et al. Microflora related to the nitrogen cycle in the tropical paddy soils , 1979 .

[9] A. B. Stewart,et al. Colorimetric determination of readily soluble phosphate in soils , 1941 .

[10] P. De. The Role of Blue-Green Algae in Nitrogen Fixation in Rice-Fields , 1939 .

[11] A. Walkley,et al. AN EXAMINATION OF THE DEGTJAREFF METHOD FOR DETERMINING SOIL ORGANIC MATTER, AND A PROPOSED MODIFICATION OF THE CHROMIC ACID TITRATION METHOD , 1934 .