The results showed that about 7 – 64% of the rice roots were infected by AMF
community. The infection structure included 3 main types of hyphae, arbuscules and vesicules.
The density of AMF spores presented in the soil samples ranged from 500 to 1635 spores/100g
of dry soil. The percentage of the AMF colonization had a positive correlation with soil pH
value (r=0.72*), a negative correlation with electric conductivity EC (r=-0.87*), with organic
matter content (r=-0.77*), with total phosphorouscontent (r=-0.71*) and positive correlation
with the number of AMF spores (r=0.71*). The research illustrated the symbiosis system
between AMF and rice roots and the correlation between the occurrence of AMF and
soil pH, EC, organic matter content as well as the total phosphorous content in paddy fields
under the soil low pH