Abstract:
The Rhizobium isolate ENRI 24 Was highly affected by the high salt concentration( 0.6,0.8,1g/L) and (2 g/L), the Rhizobium colony counts were 104cfu/ml and 108 cfu/ml.
The Rhizobium strain ENRI 24 was also affected by high pH concentration. Concerning the effect of temperature, The optimum growth was found on temperature30C◦ in both of 104 and 108 ml.
In the laboratory study that the growth rate of Rhizobium varied according to the concentrations of different salts, pH values as well as different temperature in such study the number of Rhizobium ranges between 0-320 CFU/ml.
The study was conducted in both laboratory and green house facility of the College of Agricultural Studies (CAS). Sudan University of Science and technology (SUST) in Shambat to study the effect of organic fertilizer, Rhizobium inoculation, and chemical fertilizer on peanut plants growth, and to study also the effect of salinity, pH, and temperature on the bacteria of Rhizobium growth in laboratory.
The results of the study showed that compost is the best compared with the control. It gave positive effect on peanut plant shoot and root dry weight. However ,The treatments 0.8g/5kg soil and 3g/5kg soil gave the highest values of shoot and roots lengths of the plant respectively.
In addition, high values were found in the number of the main and lateral nodules at the concentration of Rhizobium 104cfu/ml and 108 cfu/ml respectively. NPK was significantly high compared to the control in treatments of Rhizobium at 104cfu/ml and 108cfu/ml.
