How to add iron to sand-capped soil
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Old 03-11-2013, 08:13 PM   #1
blackphantom
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How to add iron to sand-capped soil


I've got a couple experimental walstad-style tanks (actually buckets) growing some extra plants. They seem to be doing well, except that the dwarf sagittaria all have yellowed leaves. I'm guessing iron deficiency, which I've heard sags are prone to. So, I need a way to add iron to the soil in a way that will not totally disturb the substrate. I'm thinking of either a) injecting liquid iron supplement into the substrate using a dropper or b) freezing liquid iron supplement into small cubes and then shoving them into the substrate with tweezers. What are your thoughts on either of these methods? Is there some other way that would be easier/more effective? I've never used a soil/sand substrate before, so not sure how best to remedy this without tearing up the substrate
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Old 03-11-2013, 10:17 PM   #2
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You could try something like this-
http://www.bamaplants.com/index.php?...roducts_id=103
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Old 03-12-2013, 08:56 PM   #3
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Those look like they might do the trick... What unit area do you think one capsule would cover, i.e. how should I space them to cover the whole substrate?
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Old 03-12-2013, 11:00 PM   #4
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I forgot to add, what is the actual size of the capsules? Will they be easy enough to stick under a layer of compacted sand?
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Old 03-19-2013, 04:22 AM   #5
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Any ideas?
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Old 03-19-2013, 05:02 AM   #6
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How about trying this? You can add whatever ferts you want. Clay is already iron rich, and you could add extra fe from dry ferts if you have them.
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Old 03-19-2013, 11:34 AM   #7
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The tabs aren't too big, they're very similar in size to a medicine tablet and made from the same material so they dissolve in water. With clay, you don't want too much in one area. 1 tab every 3-4" should be enough.
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Old 03-19-2013, 02:06 PM   #8
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Since it's an experiment, add a cup of red clay powder to the water colum. Turn off all water moving devices and simply allow the clay to settle under the sand cap.

You can buy gelatin caps 250ct at a health food store for $7(?) cheaper on [Ebay Link Removed] I buy powdered red clay in 20# bags for $19. A few people here sell small bags of Powdered Red Clay.
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Old 03-19-2013, 03:34 PM   #9
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With regards to your dropper idea, go buy a turkey marinade injector.. Its basically a giant hypodermic needle. Any place that sells kitchen stuff should have it.
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