Efficiency of EM and Rhizobium on Growth and Yield of Soybean

บทคัดย่อ

This pot experiment was performed in order to show the effect of EM and rhizobial inoculation on growth and yield of soybean. The design of the experiment was randomized complete block with 9 treatments and each treatment with eight replications. Soil and Soybean used were Korat Series soil at the rate of 30 kg/pot S.J.5. variety, respectively. The treatments were as follows: (1) without inoculations either of EM or rhizobium. (control) (2) with sterilized EM inoculation. (3) with EM inoculation (4) with rhizobial inoculation (5) with N-fertilization at the rate of 20 kg.N/rai (6) with rhizobial inoculation and sterilized EM inoculation. (7) with EM and rhizobial inoculation (8) with N-fertilization at the rate of 20 kg N/rai and sterilized EM inoculation. (9) with N-fertilization at the rate of 20 kg N/rai and EM inoculation. The results of the experiment showed that the number of nodules and efficiency on nitrogen fixation of soybeans of all treatments with rhizobial inoculation were highest and significantly different from those without rhizobial inoculation. EM inoculation with or without being sterilized gave no different effects on nodulation, nitrogen fixation efficiency and yield of soybeans when compared with the control. Dry weight of soybean from treatments with rhizobial inoculation and with N-fertilization was increased significantly when compared with that from treatments with EM inoculation with or without having been sterilized.