Enhancing the Efficiency of Soybean Inoculant for Nodulation under Multi-Environmental Stress Conditions oleh JENJIRA WONGDEE, WATCHARIN YUTTAVANICHAKUL, APHAKORN LONGTHONGLANG, KAMONLUCK TEAMTISONG, NANTAKORN BOONKERD, NEUNG TEAUMROONG, PANLADA TITTABUTR