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Soil and Composting: colloidal phosphate - what's the best source?

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Forum: Soil and CompostingReplies: 4, Views: 164
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Elphaba

Elphaba
Rockport, TX
(Zone 9a)

November 1, 2008
7:01 PM

Post #5740709

I've had a problem with whiteflies for years. I've gotten it under control somewhat by removing some of the plants that were most susceptible, removing infected foliage when I can, and by spraying the worst infestations with insecticidal soap. That's way too much work.

My Texas Bug Book says that whitefly infestations usually mean that your soil is low in phosphate and that if you add colloidal phosphate, you won't have a problem anymore. OK, great, where do I find this phosphate? Please help! Thanks!

frostweed

frostweed
Josephine, Arlington, TX
(Zone 8a)

November 25, 2008
10:26 PM

Post #5830850

Elphaba, as far as I know colloidal phosphate is basically natural rock phosphate, and you can find it at most organic nurseries, here is a link to different sources.
http://www.google.com/search?q=rock+phosphate&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Josephine.

Elphaba

Elphaba
Rockport, TX
(Zone 9a)

November 26, 2008
3:01 PM

Post #5832739

Thanks Josephine! I'm finally getting my ceiling fixed from Ike damage and it's costing $500 more than the insurance gave me for it, so I'm probably going to have to wait on most gardening projects for a while! Darn it! Thanks for the info. I wasn't sure at all what it was!

frostweed

frostweed
Josephine, Arlington, TX
(Zone 8a)

November 26, 2008
4:40 PM

Post #5833041

Sorry you are having extra expenses from the hurricane, house repairs are sooo expensive!!!
Have a Happy Thanksgiving anyway.
Josephine.

darius

darius
So.App.Mtns.
United States
(Zone 5b)

April 18, 2009
10:30 PM

Post #6429352

Phosphates are generally either Hard Rock Phosphate (most common) or Soft Rock Phosphate, which is a by-product of phosphate mining and far less available. When rock phosphate is dug and crushed, the powdery residue is washed off. It is pumped into ponds to dry, and sold as SRP. It is colloidal phosphate, and is readily-available phosphate in the soil. Regular phosphate can take up to 5 years to become available to plants.

I buy SRP as CalPhos, $10.50 for 50 pound bag.

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