Effect of Different Salt Concentrations and pH on the Growth of Rhizobium Isolated from Groundnuts (Arachis hypogaea).

Groundnut nodules shapes, sizes and colour inside denote that the crop is being nodulated by 4 strains. It is expected that those nodules having different shapes small round, double, triple and single large, may not have the same efficiency in fixing nitrogen. Four isolates were isolated from four different shapes of nodules and laboratory experiment was conducted to find out the effect of different salts concentration ( 0,1,2,3,4,5,and 6% w/v), various pH levels (5,6,7,8,9, and 10) and different carbon sources on the growth of these isolates. The results indicated that the four isolates have different response to salinity, acidity and growth on different carbon sources.