Abstract: The effects of different initial inoculate rate on the surface of soybean seed on root colonization dynamics and nodulation in soybean rhizosphere by Sinorhizobium fredii HN01DL in sterilized and non-sterilized soil pot microcosm were studied. The results showed that the root colonization dynamics and level at the very early stage were significantly different due to the three different inoculation rates. But the difference decreased gradually with the growth of host plant root system. The entire colonization dynamics curve and colonization density tended to change in the same direction. It was also found that there was no obvious influence on nodulation number and nodule occupancy by three different initial inoculation rates in the root system of host soybean Heinong 33 variety.

Key words: Shellfish, Carrying capacity, Suitable culture area, Dadeng Island sea area