Application of furfural and benzaldehyde to soil causes both quantitative and qualitative shifts in the composition of the soil bacterial community (Bauske et al., 1997).
After decreasing in the first 24 h after application, bacterial populations increased 1 week after application and remained higher than in non-treated control soils for 7 weeks (Kloepper et al., 1999).
In the present study, increasing both fungal and bacterial population in treated rhizospheric soil to reach the nearest counts in untreated soil is an expected phenomenon for microbial equilibrium in nature. Initial population of soil microflora increasing throughout the growing season enhanced with favorable conditions lead to rapid propagation in the plant root region, e.g. root exudates,
plant debris and other organic materials especially in tomato plants which received the traditional fertilizers needed (El-Said, 1997).