scholarly journals Investigation on the Nitrogen Fixing Cyanobacteria (BGA) in Rice Fields of North-West Region of Bangladesh. III: Filamentous (Heterocystous)

2015 ◽  
Vol 6 (1) ◽  
pp. 253-259
Author(s):  
MA Hasan
Keyword(s):  
Distribution Pattern ◽  
Agricultural Land ◽  
Rice Fields ◽  
Atmospheric Nitrogen ◽  
Nitrogen Fixing ◽  
North West ◽  
Blue Green Algae ◽  
Green Algal ◽  
West Region ◽  
Growth Promoting

The experiment was conducted to carry out the nitrogen fixing cyanobacterial (BGA) resources and their distribution pattern in rice fields of North-West region of Bangladesh during the period of 2011. Considering the vast importance of Blue-green algae (BGA) in agricultural land especially in rice fields, their twelve months long systematic was undertaken. A total of 10 genera with 37 species of filamentous-heterocystous blue-green algal forms were identified and recorded from this region. Out of 37 species, 9 species belonging to the genus Anabaena, 8 to Nostoc, 5 to Cylindrospermum, 4 to Calothrix, 3 to Rivularia, 3 to Gloeotrichia and 2 to Aulosira; while 1 species belonging to each genus of Anabaenopsis, Microcheate and Aphanizomenon. The distribution pattern of filamentous-heterocystous BGA in rice fields over the study area has also been observed in this study. With few exceptions, the filamentous-heterocystous BGA are more or less uniformly distributed all over the study areas. All of the BGA members have a tremendous ability to contribute on enhancing agricultural production by fixing atmospheric nitrogen and adding organic matter, vitamins, growth promoting substances etc to the soil and crops.DOI: http://dx.doi.org/10.3329/jesnr.v6i1.22075 J. Environ. Sci. & Natusral Resources, 6(1): 253-259 2013

scholarly journals Investigation on the Nitrogen Fixing Cyanobacteria (BGA) in Rice Fields of North-West Region of Bangladesh. I: Nonfilamentous

2013 ◽  
Vol 5 (2) ◽  
pp. 185-192 ◽  
Author(s):  
MA Hasan
Keyword(s):  
Distribution Pattern ◽  
Agricultural Land ◽  
Rice Fields ◽  
Nitrogen Fixing ◽  
Systematic Observation ◽  
North West ◽  
Blue Green Algae ◽  
Green Algal ◽  
West Region ◽  
Growth Promoting

The experiment was conducted to carry out the nitrogen fixing cyanobaterial (BGA) resources and their distribution pattern in rice fields of North-West region of Bangladesh during the period of 2011. Considering the vast importance of Blue-green algae (BGA) in agricultural land especially in rice fields, twelve months long systematic observation was undertaken. A total of 15 genera with 42 species of non-filamentous (unicellular and colonial) blue-green algal forms were identified and recorded from this region. Out of 42 species, 9 species belonging to the genus Aphanocapsa, 8 to Chroococcus, 5 to Gloeocapsa, 4 to Aphanothece, 3 to Gloeothece, 3 to Merismopedia and 2 to Coelosphaerium; while 1 species belonging to each genus of Chroococcidiopsis, Synechococcus, Synechocystis, Dactylococcopsis, Microcystis, Myxosarcina, Hydrococcus and Xenococcus. The distribution pattern of non-filamentous BGA in rice fields over the study area has also been observed in this study. With few exceptions, the non-filamentous BGA are more or less uniformly distributed all over the study areas. All of the BGA members have a tremendous ability to contribute on enhancing agricultural production by fixing atmospheric nitrogen and adding organic matter, vitamins, growth promoting substances etc to the soil and crops.DOI: http://dx.doi.org/10.3329/jesnr.v5i2.14812 J. Environ. Sci. & Natural Resources, 5(2): 185-192 2012

Isolation and taxonomy of the blue-green algae (Cyanobacteria), Nostoc and Anabaena in Kerala State, India

2020 ◽  
Vol 62 (1-2) ◽  
pp. 163-174
Author(s):  
T. S. Thilak ◽  
P. V. Madhusoodanan ◽  
N. S. Pradeep ◽  
R. Prakashkumar
Keyword(s):  
Green Algae ◽  
Pure Culture ◽  
Paddy Fields ◽  
Atmospheric Nitrogen ◽  
Nitrogen Fixing ◽  
Blue Green Algae ◽  
Heterocystous Cyanobacteria ◽  
Pure Cultures ◽  
Photosynthetic Microorganisms ◽  
Kerala State

Blue-green algae (also called cyanobacteria) are ubiquitous, pristine and pioneer photosynthetic microorganisms. Many species of cyanobacteria are capable of fixing atmospheric nitrogen and such species in wet soils are simultaneously augmenting the fertility of the soil, acting as natural bio-fertilizers. Nostoc and Anabaena are the two important genera of heterocystous cyanobacteria capable of contributing nitrogen to soil, especially in paddy fields. The major objectives of the investigation included survey, collection, isolation and pure culture of nitrogen-fixing species of Cyanobacteria in the soils of Kerala state, India. Altogether, pure cultures of 12 species of Nostoc and 5 species of Anabaena are prepared.

Nitrogen-fixing blue-green algae in acid forest and nursery soils

1968 ◽  
Vol 14 (11) ◽  
pp. 1179-1183 ◽  
Author(s):  
M. F. Jurgensen ◽  
C. B. Davey
Keyword(s):  
Forest Soils ◽  
Atlantic Coast ◽  
Appalachian Mountains ◽  
Soil Surface ◽  
Nostoc Muscorum ◽  
Algal Flora ◽  
Nitrogen Fixing ◽  
Nostoc Commune ◽  
Blue Green Algae ◽  
Green Algal

Algal populations were studied in soils from sites representing several major forest types ranging from the spruce–fir forests in the Appalachian Mountains to the Southern pine forests along the Atlantic Coast. In addition, the nitrogen-fixing blue-green algal population of a forest tree nursery was examined.The results of this investigation indicate a general lack of nitrogen-fixing algae in acid forest soils. However, a pronounced development of these algae was observed in the acid nursery soil, especially on the soil surface. Low numbers of algae were found in some forest soils but only when the soil was above pH 5.4. No nitrogen-fixing Cyanophyceae were isolated from soils in the Appalachian Mountains regardless of soil acidity. Nostoc muscorum was the most common nitrogen-fixing species occurring under both forest and nursery conditions. Nostoc commune was isolated only from the nursery soil. Several strains of Nostoc ellipsosporum were obtained from a mixed hardwood–softwood site. An examination of the algal flora of a number of Alaskan tundra soils gave results similar to those found in the forest soils.

scholarly journals The distribution of blue-green algae (Cyanobacteria) from the paddy fields of Patan and Karad tehsils of Satara District, Maharashtra, India

2019 ◽  
Vol 11 (14) ◽  
pp. 14862-14869 ◽  
Author(s):  
Sharada Jagannath Ghadage ◽  
Vaneeta Chandrashekhar Karande
Keyword(s):  
Distribution Pattern ◽  
Green Algae ◽  
Paddy Field ◽  
Chemical Properties ◽  
Soil Samples ◽  
Paddy Fields ◽  
Available N ◽  
Blue Green Algae ◽  
Green Algal ◽  
Physico Chemical

The distribution pattern of blue-green algae was studied from paddy fields of Patan and Karad tehsils in relation to physico-chemical properties of soil, viz., pH, electrical conductivity, organic carbon %, available N, P, and K.  Paddy field soil samples of 38 localities from Patan and 28 localities from Karad were analysed.  One-hundred-and-thirty-seven species belonging to 35 genera of 10 families from three orders were encountered from paddy field soils of both the tehsils.  Out of 66 soil samples 93.65% samples showed occurrence of unicellular, heterocystous and non heterocystous forms while 6.34% soil samples showed only non heterocystous forms.  Anabaena and Oscillatoria were found to be of common occurrence.  Significant variation was not observed in distribution pattern of blue-green algal forms in relation to physico-chemical properties during successive surveys.

Evaluation of genetic diversity and plant growth promoting activities of nitrogen-fixing bacilli isolated from rice fields in South Brazil

2008 ◽  
Vol 39 (3) ◽  
pp. 311-320 ◽  
Author(s):  
Anelise Beneduzi ◽  
Daiane Peres ◽  
Luciano K. Vargas ◽  
Maria Helena Bodanese-Zanettini ◽  
Luciane Maria P. Passaglia
Keyword(s):  
Genetic Diversity ◽  
Plant Growth ◽  
Rice Fields ◽  
Nitrogen Fixing ◽  
Plant Growth Promoting Activities ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
South Brazil

An Empirical Study of Human Trafficking Law in Cameroon: Victims Rarely Seek Justice and Traffickers Are Not Held Liable

2017 ◽  
Vol 25 (3) ◽  
pp. 430-441
Author(s):  
Monique Aziza
Keyword(s):  
Empirical Study ◽  
Primary School ◽  
Human Trafficking ◽  
Government Officials ◽  
North West ◽  
The North ◽  
West Region ◽  
Arduous Task ◽  
Adults And Children

This article argues that the number of unprosecuted human traffickers is growing in Cameroon. This article aims to examine Cameroonian government officials, prosecutors and judiciary attitudes to human trafficking laws, which endanger Cameroonians. This article is an empirical study of victims of human trafficking. It takes an objective look at Cameroon's anti-trafficking law that criminalises the trafficking of adults and children. It is evident that societal discrimination towards the North West region, lack of opportunities for free education or to a trade post-primary school and the lack of enforcement of the anti-trafficking law are making combating human trafficking an arduous task.

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