Nutrient agar medium is better to non-selective isolation. But I think the nutrient content of the medium depends on the microbes present in your sample. According to the J.C Tarafdar suggestion you can use soil extract agar medium. Analysis of the nutrient content of your soil extract and modified your medium adjusting the content to obtained significant growth.

@ Yoga, I think you may try with either Soil extract agar media or Dextrone-peptone yeast extract agar media or Nutrient broth media.

For non selective isolation you can use Nutrient agar media.

For details:-

https://microbiologyinfo.com/nutrient-agar-composition-preparation-and-uses/

Nutrient agar medium is better to non-selective isolation. But I think the nutrient content of the medium depends on the microbes present in your sample. According to the J.C Tarafdar suggestion you can use soil extract agar medium. Analysis of the nutrient content of your soil extract and modified your medium adjusting the content to obtained significant growth.

how about soil extract medium ? is this recommend for fungi growth ?

Nutrient Agar media for bacteria (The bacteria will grow within 2 days) and SDA or PDA for fungi (It will take around 5 to 14 days to grow). Temperature 28 to 30 degrees. Hope it helps.

Make sure you make several dilutions before plating.

Most bacteria will grow well using nutrient agar, but some more fastidious bacteria prefer tryptic soy agar.

General purpose media that are commonly used for fungal culture are Sabouraud dextrose, malt extract and less commonly brain heart infusion medium.