gypsum plus ast for gritty mix? opinion, please?

merrybookwyrmJuly 19, 2012

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.

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tapla (mid-MI z5b-6a)

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

    Bookmark   July 19, 2012 at 4:12PM
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merrybookwyrm

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

    Bookmark   July 19, 2012 at 8:08PM
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tapla (mid-MI z5b-6a)

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

Al

    Bookmark   July 20, 2012 at 5:11PM
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