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Abstract

Studies on Azospirillum isolated from the soils of Thiruvarur Dt., Tamilnadu, India

Totally 10 different paddy field soils were collected from in and around Thiruvarur district, Tamilnadu and their physico-chemical properties and population density of Azospirillum were analyzed. Among them, 5 samples were sandy clay loamy soil, while 3 samples were loamy soil and 2 samples were sandy loam. The pH (7.2-8.2), bulk density (1.11g/cm3 -1.60g/cm3), water holding capacity (33.41% - 18.31%), electrical conductivity (0.89 - 0.24), organic carbon (0.97% - 0.57%), total nitrogen (1.72% - 0.75% ), phosphorus content (0.185% - 0.125%), potassium (1.85% - 1.18%) also available micronutrients like Zn (2.03% - 1.16%), Cu (3.68% - 1.27%), Fe (9.16% - 7.40%), Mn (5.21% - 3.10%), B (0.590% - 0.390%), available nitrogen (191.0kg/acre - 110.5kg/acre), phosphorous (9.6kg/acre - 4.5kg/acre), potassium (295.0kg/acre - 190.5kg/acre) were in all sampling station. The population density of Azospirillum was maximum observed in sandy loam soil at Kudavasal. The minimum population density was observed in loamy soil at Thiruthuraipoondi


Author(s): Senthil Kumar. R and Panneerselvam. A

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