| In this paper the composition of actinomycetes sorts and their antagonism was investigated,which were separated from the saline soils of the upper and middle reaches of Yellow River.The results show that the main sort of actinomycetes in this area is Streptomyces,and the other genus only occupies by 9.27%. Globosporu,Roseosporus,Griseofuscus and Flavus are the major genus among Streptomyces.The strains of actinomycetes which have antagonistic activity occupy 76.44% of the 706 strains tested,but few are broad-spectrum strains;these strains have stronger antagonistic capability to bacteria than to fungi;the dominant genus of antagonistic actinomycetes are Roseosporus,Griseofuscus and Globosporu.Through the antagonistic test of ferment filtrate, 4 strains that can produce some substance with higher antagonistic activity have been screened;three of them belong to Roseosporus. |