Return to the Container Gardening Forum | Post a Follow-Up

 o
gypsum plus ast for gritty mix? opinion, please?

Posted by merrybookwyrm 7/8 dfw (My Page) on
Thu, Jul 19, 12 at 10:32

Hello everyone. Would you give your opinions, please? The gypsum available for making gritty mix is "gypsum plus ast", which seems to mean this gypsum has added calcium and added sulfur. Would this be a problem? Thank you.


Follow-Up Postings:

 o
RE: gypsum plus ast for gritty mix? opinion, please?

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Thu, Jul 19, 12 at 16:12

Gypsum IS calcium and sulfur, plus oxygen (CaSO4). The AST part means 'Advanced Soil Technology'. I've never used it, so I can't say how well it will perform. The coating might swell up a lot in soils (see link below), but it's only 2% of the product.

Al

Calcium Sulfate-Dihydrate (CaSO -2H 0) .......................................... 92%
Calcium (Ca) ................................ 20%
Sulfur (S) .................................. 16%
16% Combined Sulfur (S)
Derived from mined gypsum (calcium sulfate dihydrate (CaSO -2H O)) F14

ALSO CONTAINS NONPLANT FOOD INGREDIENTS:
SOIL AMENDING GUARANTEED ANALYSIS

ACTIVE INGREDIENTS
1.5% Polymers
1.0% Anionic Polyacrylamide Copolymer (Emulsion)
0.5% Anionic Polyacrylamide Copolymer (Solid)

INERT INGREDIENTS
Gypsum ...........................92%
Lignosulfonates (Binding agent) ........................... 2%

Here is a link that might be useful: Read more about the polyacrylamide coating


 o
RE: gypsum plus ast for gritty mix? opinion, please?

Thank you. I have -no- idea what I'm doing... hoping I don't kill the tangerine seedlings I've been nursing along.


 o
RE: gypsum plus ast for gritty mix? opinion, please?

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Fri, Jul 20, 12 at 17:11

You can be sure we're all hoping right along with you. ;-) Good Luck!

Al


 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 Container Gardening 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