Return to the Soil Forum | Post a Follow-Up

 o
Stone dust as amendment?

Posted by nygardener z6 New York (My Page) on
Thu, Jul 9, 09 at 3:14

I came across some stone dust at a landscaper's and am thinking of using it as a soil amendment to improve the texture and mineral content of my clay-ey soil. Thoughts?


Follow-Up Postings:

 o
RE: Stone dust as amendment?

To make any significant change in your clayey soil you would need tons of that stone dust and then, aside from maybe opening up the pore spaces, you would not have a better soil unless you also added copious quantities of organic matter which will do more to make that clayey soil better than all the stone dust you can find.


 o
RE: Stone dust as amendment?

Thanks, kimmsr. I'm planning to add plenty of organic matter as well.

I'd like to focus on the value of stone dust itself. Does anyone know specifically whether it will "open up the pore spaces" or otherwise improve the tilth, drainage, mineral content, nutrient availability, etc. of the soil? Are the particle sizes too large or too small to be suitable? Since stone dust is a byproduct, is it generally clean? How does it compare with sand as a way to improve the non-"organic" component of the soil?


 o
RE: Stone dust as amendment?

Granite screenings or granite sand contain 60 trace minerals which will help improve the soil health and health of the plants grown in it.

I can't recall for sure if it's from one of Sir Alber Howards books or William Albrechts but I can say it was from my readings at the agricultural library.

It's also not going to hurt soil quality in a clay soil.

Here is a link that might be useful: agricultural library


 o
RE: Stone dust as amendment?

Does anyone know specifically whether it will "open up the pore spaces" or otherwise improve the tilth, drainage, mineral content, nutrient availability, etc. of the soil? Are the particle sizes too large or too small to be suitable?

It depends upon what type of stone (presume granite up there) and the particle size. It likely will add minerals and possibly improve Cation Exchange Capacity. Depending upon the ratio of addition, unless you add a ton probably won't do much for drainage. But just for mineral content and CEC, ISTM it is a net positive if the particle size is that of loam or larger. OM will improive tilth.

Dan


 o
RE: Stone dust as amendment?

  • Posted by jean001 z8aPortland, OR (My Page) on
    Fri, Jul 10, 09 at 0:16

Dust won't open clay at all. It will make things worse than they are. Use compost instead, at least 2 inches of it.


 o
RE: Stone dust as amendment?

Jean, is that because the particle sizes are too small, or is there something else about this material that wouldn't mix well with clay-ey soil and organic matter (compost)?


 o
RE: Stone dust as amendment?

There is an old myth, one that I subscribed to for years, that adding sand, stone dust, to clay soils would give you an adobe like soil. However, according to the instructions on making Adobe from the University of New Mexico that is not how to make Adobe. Adding the stone dust to your clay soil would be like adding any other type of sand, or granite dust which is stone dust, or rock phosphate which is stone dust, or limestone which is rock dust, or greensand which is also a rock dust.
Depending on the source of that stone dust and how much baterial activity your soil has that stone dust could provide some type of necesssary macro and micro nutrients.


 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.
  • 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