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一种新菌株能将美国的大豆产量提高5%～7%。由此每年可给农民带来5.07亿美元的额外收入。马里兰州微生物学家 Kuykendall 采取化学突变法对 Bradyrhizobium 菌株进行了改良,使其比
A new strain can increase soybean yields in the United States by 5% to 7%. This will give farmers an additional 507 million U.S. dollars in extra income every year. Maryland microbiologist Kuykendall took a chemical mutation to improve the Bradyrhizobium strain so that its ratio