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Bacterial diversity and total viable counts of bacteria of the differentsoil samples from two different localities in Omdurman north region—Karary and Khor Omer sub-regions—were carried out. Soil physical and chemical characteristics (pH, EC, SP,solublecations: Na, K, Ca, Mg and anion P, organic carbon, total nitrogen andsoil texture) in each studied sub-regions were measured. Qualitative analysisof microorganisms isolated from the studied soil samples reveals a total ofmore than eight different species of bacteria, of which two are unidentified.The six species are classified under Bacillus genera. In Omdurman north regionsoil samples, total bacterial counts ranged from 7.5 × 103 cfu·g1 to 1 × 104 with a mean of 4 × 104 cfu·g1. The quantitative data on microbial population recorded inthe present study were analysed using two diversity indices. High Shannon-Weinerdiversity index value for bacteria was obtained in Khor Omer sub-region(1.71261). Actinomyces spp.and Streptomyces spp.were the most abundant microorganisms identified in the two sub-regions. Totalbacterial count in Karary soil was positively correlated with EC (r = 0.3868), clay(r = 0.1412), sand (r = 0.5891) and K (r = 0.0265) and negatively correlatedwith pH, silt, SP, Na, P, Ca, Mg, N and OC whereas the total bacterial count inKhor Omer soil was positively correlated with EC (r = 0.3973), clay (r =0.1966), silt (r = 0.2116), Ca (r = 0.6733), Mg (r = 0.586) and OC (r = 0.2368)and negatively correlated with pH, sand, SP, Na, K, P and N. There were obviousdifferences in correlation coefficients among the selected criteria (37% of thetotal number of correlation coefficients were positively correlated betweenbacterial counts and soil physico-chemical properties whereas 63% of the totalnumber were positively correlated between plant type and bacterial counts). Theformulation of an appropriate national strategy in biotechnology shouldconstitute an important, initial step towards the utilization and industrializationof microorganisms. The development of molecular techniques of microbialidentification, coupled with traditional methods is promising areas forcontinued research.

Effect of Soil Physico-Chemical Properties and Plant Type on Bacterial Diversity in Semi-Arid Parts in Central Sudan. Part I: Omdurman North Region