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据Weiss等在威斯康辛大学的研究报道:在室温22～25℃条件下用蛭石培养的大豆根瘤菌剂一星期,菌数可增加1000倍,7～12天菌数可达10~8～10~9个/克菌剂,在室温下贮藏1个月菌数可超过10~9个/克菌剂;
According to a study by Weiss et al. At the University of Wisconsin, a strain of soybean rhizobium cultured with vermiculite at room temperature of 22-25 ° C for one week can increase the number of bacteria by 1000 times and the number of bacteria by 7-12 days by 10-8-10 ~ 9 / bacteria agent, stored at room temperature for 1 month the number of bacteria can exceed 10 ~ 9 / bacteria agent;