引言固氮菌(Azotobacter)作为细菌肥料,供给植物对氮素的需要,在农业上已经是久已普遍采用的施肥措施了。近年来,随着农业的大跃进和各方面技术革命的发展,曾有利用褐色球形固氮菌混合饲料养猪而获得高速增肉率的先进事例,如广东高鹤县鹤城红旗人民公社细菌肥料厂,1958年10月采用土制褐色球形 Introduction Azotobacter, as a bacterial fertilizer that supplies plants with nitrogen needs, has long been a fertility measure in agriculture. In recent years, with the great leap forward in agriculture and the development of various technological revolutions, there have been advanced cases of using piglets with brown spherical nitrogen-fixing bacteria to obtain high-speed meat-growing rates. For example, the bacterial fertilizer Plant, October 1958 with brown earth-made ball