Abstract: The present study deals with the soil samples collected from various places at Cuddalore district, Tamil Nadu, India for isolation of Azospirillum isolates and investigated. The physico-chemical properties of rice soil samples were analyzed. Soil organic carbon content ranged from 0.272 to 0.55%, pH ranged from 7.3 to 8.3 and EC ranged from 0.59 to 2.70 dSm-1. The N status was categorized as low ranged from 112 to 160 kg ha-1. The available potassium ranged from 90 to 245.50 kg ha-1 and phosphorous ranged from 7.6 to 12.85 kg ha-1. Five Azospirillum isolates were obtained, characterized and designated as SFA-1 to SFA-5. Out of five four belongs to Azospirillum brasilense and one belongs to Azospirillum lipoferum. One isolate observed to be nir+ and the remaining four nir-. The inoculation of stress tolerant SFA–1 to rice plants increased plant height, fresh and dry weight of shoot and root significantly, While other isolate treatment slightly increase the morphological parameters when compared to control (without adding N and Azospirillum). But, The Azospirillum SFA-1 inoculation at graded levels of nitrogen i.e., 75N + 25% Azospirillum increases the shoot and root growth, fresh and dry weight of shoot and root when compared to control considerably.
Keywords: microorganism, isolation, Azospirillum isolates, appearance of Azospirillum culture, saline soil, rice plant.
Title: Characterization and crop production Efficiency of Diazotrophic bacterial isolates from coastal saline soils
Author: A. Venkatesan, S. Jayakumar, G. Mathan, R.Sridharan, P.Sundaramoorthy
International Journal of Life Sciences Research
ISSN 2348-313X (Print), ISSN 2348-3148 (online)
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