“五四○六”放线菌生长迅速,传代快,一年上百代,容易退化、变杂。因此,需要不断进行提纯复壮,才能保证菌肥质量和使用效果。“五四○六”菌种退化具体表现为菌层变薄,生长迟缓,色泽变白或变黄,不产生露珠等。如果受“噬菌 “504” Actinomycetes grow rapidly, pass fast, a hundred times a year, easy to degenerate, mixed. Therefore, the need for continuous purification and rejuvenation, in order to ensure the quality and use of bactericidal effect. “5460” species degradation manifested as thin layer of bacteria, growth retardation, white or yellow color, do not produce dew and so on. If by "phagocytosis