National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Cyanobacteria are a group of prokaryotic microorganisms having a unique characteristic to carry out oxygenic photosynthesis. They have the capacity to fix atmospheric nitrogen due to presence of nitrogenase in their heterocysts. They are known to play a very important role in organic agriculture making them an important member in the crop fields especially in the flooded rice soil.The information regarding the native cyanobacteria of Bihar being inadequate, a vivid knowledge in this aspect is essential for its application as a biofertilizer. The present investigation was carried out on the study of diversity of cyanobacteria in paddy fields of 2 different districts of Bihar. Soil samples were collected aseptically from 3 different sampling sites of Gaya viz., G1, G2 and G3. Two sites were selected in Supaul viz., S1 and S2. During sampling, physicochemical properties were recorded. Temperature of Gaya sites ranged from 21.5-23?C, while that of Supaul was 19-21?C. pH of soil samples of Gaya ranged between 7.3-7.4, whereas that of Supaul was slightly more alkaline ranging from 7.8-7.9. Cyanobacteria were isolated aseptically and identified as Nostoc sp., Anabaena sp., Aulosira sp., Oscillatoria sp., Scytonema sp. and Microcoleussp. Both sites consisted of approximately equal numbers of heterocystous and non-heterocystous forms indicating effect of nitrogen fixing organisms in the paddy fields for the crop fertility improvisation. The present observation indicates that the soil of paddy fields of Supaul constitutes more diverse population of cyanobacteria than the soil of Gaya whereas more heterocystous forms were found in Gaya in comparison to Supaul. The success of cyanobacterial application in rice fields depends on the local circumstances and local awareness.
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