Assessment of nitrogen fixing efficiency of Bradyrhizobial isolates from the coastal tracts of Cuddalore District

Abstract

Salinization is one of the most crucial factors threatening agricultural land throughout the world. Approximately one third of the 260 million ha of irrigated land worldwide is affected by salinization (El-Akhal et al., 2013) [3]. Salinity limiting the productivity of crop plants because most of the crop plants are sensitive to salinity caused by high concentrations of salts in the soil, and the area of land affected by it is increasing day by day. Now we focused the native rhizobia from Cuddalore District. In this study, total thirty rhizobial isolates were tested for their ARA activity, N content and leghaemoglobin content of modules. Among the thirty isolates such as GNBJ- 4, GNBJ- 8, GNBJ- 9 and GNBJ- 28 produced ARA activity in the range of 188.25 to 215.40 n moles C2H4 formed h-1g-1, Nitrogen content in the range of 6.50 to 7.20% and leghaemoglobin content ranged from 0.185 to 2.110 nodule mg g-1