Fresh weights of yard long bean cultivars : With fresh weights of the yard long bean plants, the results showed that fresh weights/plant of the crop plants of both white subplots had significantly greater amounts of rhizobialseeded and KKU25 cultivars were similar in all methods of management subplots with the mean values of 800, 697, 842, and 784 mg/plant for control (added with 70ppm N) non-managed, and managed with the growth of white seeded yard long bean plants, and managed with the growth of KKU25 yard long bean plant, respectively (table 5 ). There were no statistically significant differences among the management subplots. The results indicated that the growth of yard long bean plants of the control subplots had received adequate amount of nitrogen from the added amount of 70 ppm to the growth medium. However, the advantage in using native rhizobial population being added to the test tubes instead of the application of nitrogen could be of important value in growing this legume crop since no expenses on nitrogen chemical fertilizer had been required for the growth of the crop plants. The finding confirms the work reported by Rungrattanakasin et al. (2002). Therefore, this approach in evaluating rhizobial population, nodulation and growth of yard long bean plant could possibly be of valuable choice for growers of field grown leguminous crop in at large.