“奇四”是1953年从山西省某地棉花根土中分离出来的一种抗生菌。经过多年反复试验,它和“5406”的性能类似,在农业生产上也有很大效用。“奇四”和“5406”同属放线菌类的弗氏种组。在一般斜面培养基上呈粉白带微红色的菌层,在饼土中生长成银白色的菌肥,带有清凉的香味。它的生物学特性、土法生产以及应用方法等各方面,都与“5406”相同(参见本刊第二期)。 “Odd four ” is a kind of antibiotic isolated from cotton roots in Shanxi Province in 1953. After many years of trial and error, it has similar performance to 5406 and has great utility in agricultural production. “Odd four ” and “5406 ” belong to Actinomyces species Freund spp. In general beveled medium was pink with a reddish coat, grow in the cakes of silver-white fertilizer, with a cool scent. Its biological characteristics, soil production and application methods and other aspects, are the same as “5406 ” (see the second issue of this issue).