Through ph test, you can identify

You should either make a slide from the edge of each colony you want to identify, and through staining techniques can id what you have.  You can also subculture each colony onto more specific media for growing bacteria or fungi and use these results.

Yes, I agree with the answers given above. You can use any one of the major characteristics to identify your soil isolates. Some of the major microbial characteristics include morphological, cultural and nutritional, metabolic, genetic, pathogenic, and antigenic characteristics. For example, you can use typical metabolic characteristics to differentiate a bacterial colony from fungi.  You can use antibiotics for selection of fungi colony from bacterial colony or you can use anti-fungal agents to select bacterial colony from fungal colonies. 

You can identify it through using selective media also

These links may help you

https://www.ncbi.nlm.nih.gov/pubmed/22791233

http://aem.asm.org/content/73/8/2708.full

http://www.cellulosechemtechnol.ro/pdf/CCT3-4(2012)/p.227-242.pdf

http://sciencing.com/do-isolate-bacteria-soil-6918955.html

Article Isolation and identification of soil bacteria growing at the...

thank you so much