Influence of nitrogen fertilizer application and Rhizobium inoculation on common bean (Phaseolus vulgaris, L) was preceded in ’Chen chu lau’ red loam system at Wipe. On the pod products of common bean, treatment with Rhizobium spp. inoculated and without nitrogen fertilizer applied had increased production 4.3% compared to non-inoculated treatment. When added nitrogen fertilizer 40 kg/ha with Rhizobium spp. inoculated had increased 4.2% more production than non-inoculated (CK). When added nitrogen fertilizer 120 kg/ha with Rhizobium spp. Inoculated had increased 3.4% more production than the treatment of nitrogen fertilizer 120 kg/ha with non-inoculated. From our data, cultured common bean with Rhizobium agent could increase pod production. The leaf nitrogen concentrations of common bean were 20.7, 23.3, 27.9 and 31.6a g/kg when the nitrogen fertilizer applied quantities were 0, 40, 80 and 120 kg/ha. From this data, there were significantly multiple reflection between the amounts of nitrogen fertilizer and the leaf nitrogen concentration of common bean. Cultured common bean with Rhizobium agent on different applied nitrogen fertilizer quantity, the average of root knot of form were 43.5, 41.5, 28.0 and 28.8 granule/plant on the treatment of 0, 40, 80 and 120 kg/ha nitrogen fertilizer. From our data, we found much nitrogen fertilizer used would inhibit the formation of root knot.

Key words: Rhizobium, nitrogen fertilizer, common bean.