美科学家正在研究用微生物防治土传病原菌。他们将两种自然土生微生物──Ｐａｅｎｏｂａｃｉｌｌｕｓ ｍａｃｅｒａｎｓ和Ｂａｃｉｌｌｕｓ ａｍｙｌｏｌｉｇｕｅｆａｃｉｅｎ加入到名叫“生物产量２１３”的移植混合物中，移植混合物可为这两种有益微生物提供在幼苗根上生长 US scientists are studying the use of microorganisms to control soil-borne pathogens. They added two naturally occurring indigenous microorganisms, Paenobacillus macerans and Bacillus amyloliguefacien, to a transplanting mixture called “Biomass 213,” which provides the two beneficial microorganisms with growth on the seedling root