Abstract:
The dehydrogenase activity (DHA) in the rhizospheres of tomatoes grown in different soil types – Khor
Abu-Habil (KA), Bara (B), and Greenhouse (Gr) – in North
Kordofan, Sudan, was determined. In addition, the abundance of soil microbes in the tomato rhizospheres during
the two growth stages, after 45 and 90 days (short and long
term), was analyzed. The KA site (clay soil) showed the
highest DHA (81.79 CFUs/g) followed by the B site (63.76
CFUs/g) (sandy loam) after 90 days of sowing, and the Gr
site showed the lowest DHA (44.50 CFUs/g) (loamy sand
soil) after 45 days. Moreover, the presence of high microbial activity (total density counts, total fungi, phosphatesolubilizing bacteria, Streptomycetes sp., Azotobacter sp.,
Azospirillum sp., and Pseudomonas sp. density counts)
after 90 days and minimum microbial abundance after
45 days were identified at all sites. The measured growth
parameters of fresh and dry weight, in addition to the rootto-shoot ratio, increased significantly at the same KA site
dominated by a higher microbial density after 90 days.
During the long term, the growth stage was positively
affected by the abundance of adapted microbials that
improve and enhance plant growth.
