the interspecific competition among Koeleria cristata L.,Poa pratensis L.and turf important weeds-Viola prionantha was studied using the field test method from June to October in 2011.The results showed that :(1).With the competition of two kinds of turf grass,the biomass and the branches numbers of V.prionantha were significantly inhibited,the intensity of inhibition fromP.pratensis L.higher than K.cristata L.(2).The biomass and the tiller numbers of K.cristata L.significantly increased,with more significa...