Return to the Soil Forum | Post a Follow-Up

 o
1/2 Mushroom Compost + 1/2 Top Soil Mixture

Posted by mmiesse 6a (My Page) on
Wed, Apr 24, 13 at 13:56

Is 50% mushroom compost + 50% top soil a good mixture? I am starting a community vegetable garden at my apartment, and this is the soil my landlord provided for it.

Thanks!


Follow-Up Postings:

 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

It's a bit heavier than it needs to be on the compost, but it probably won't hurt the plants. If there are raised beds involved, keep in mind that as that large fraction of compost continues to decompose, the level will sink. You may have to top them off next year.

I'm sure a lot of renters would be green with envy that you have a landlord generous enough to bring in all that good stuff!


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

Awesome! Thanks!

And while my landlord does love nature, he's mostly allowing the garden to ramp up the property value.

Beggars can't be choosers, I guess...they can just be good people!


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

  • Posted by TXEB 9a (My Page) on
    Wed, Apr 24, 13 at 18:53

I would think it should be great, depending on the composition of the topsoil. With that much SMS in it, my biggest concern would be drainage. It should hold moisture really well, the issue is does it hold it too well and get mucky.

One of the experts here has list of about six things to test for good garden soil. Hopefully he'll come along and post his list again, and you can try them out and judge for yourself.


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

TXEB, what are you referring to with SMS?


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

  • Posted by TXEB 9a (My Page) on
    Thu, Apr 25, 13 at 15:17

SMS = Spent Mushroom Substrate (aka mushroom compost)


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

While both mushroom compost and top soil will provide structure and may look like good soil there is no way you will really know what is in the top soil or which nutrients are lacking that your plants require. Also mushroom manure can have high amounts of salts which may affect some plants.

A soil test might be worthwhile with this unknown 'soil'.


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

The people at Pennsylvania State University have not found soluble "salts" in enough quantity to be a problem for the plants growing in spent mushroom compost.
Most knowledgeable people suggest working 3 to 6 inches of compost, or organic matter, into soil depending on the amount of organic matter in the soil initially. Going beyond about 6 to 8 percent OM in soil does not have much benefit and can create, drainage, problems because the excess organic matter can hold too much moisture.

Here is a link that might be useful: About spent mushroom compost


 o
RE: 1/2 Mushroom Compost + 1/2 Top Soil Mixture

Everything you ever wanted to know about mushroom substrate (compost).

Here is a link that might be useful: Mushroom Substrate


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Soil Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here