Discussion forum for environmentally-friendly alternatives to replace synthetic chemicals and fertilizers.
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January 21, 2015 | #1 |
Tomatovillian™
Join Date: Jan 2011
Location: S.E. Wisconsin Zone 5b
Posts: 1,831
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Phosphorous Acid is very different than Phosphoric Acid
Phosphorous acid = H3PO3 (Also known as phosphate) As in Agri-Fos and Plant Doctor (formally Exel LG)
Phosphoric acid = H3PO4 (Also known as phosphorus) The “P” component in NPK fertilizers More on this here by amideutch http://www.tomatoville.com/showpost....08&postcount=7 I do believe at one time Agri-Fos and Exel LG were both ORMI certified. My guess is that someone put the idea in the heads of some people in the ORMI sanctioning body that H3PO3 and H3PO4 were similar. In reality they are no more similar to each other then carbon dioxide is to carbon monoxide. Carbon Dioxide = CO2 – All animals breathe this out and all plants take this in great quantities. Carbon Monoxide = CO – Deadly to all animals and plants at anything above 667 parts per million. What a different one little number can make!!! Dutch
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"Discretion is the better part of valor" Charles Churchill The intuitive mind is a gift, and the rational mind is a faithful servant. But we have created a society that honors the servant and has forgotten the gift. (paraphrased) Albert Einstein I come from a long line of sod busters, spanning back several centuries. |
January 21, 2015 | #2 |
Tomatovillian™
Join Date: Feb 2006
Location: Den of Drunken Fools
Posts: 38,539
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I usually keep a gallon of Ospho around the house.
It is 75% phosphoric acid. The stuff works wonders. |
January 21, 2015 | #3 |
Tomatovillian™
Join Date: Jun 2010
Location: Cheektowaga, NY
Posts: 2,466
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A couple correction Dutch.
Phosphorous acid (H3PO3) is also known as phosphonate, not phosphate. Pure Phosphorous acid is not used as a fungicide since it is such a powerful reducing agent, it would kill plants. It is always sold as a salt, usually as Potassium salts. Phosphoric acid (H3PO4) is also known orthophosphoric acid , not phosphorus) Phosphoric acid is highly corrosive in the concentrations like Worth uses. Phosphoric acid isn't common naturally in soil and cannot be used by plants, but in the soil it will convert to hydrogen phosphate (HPO42-) and/or dihydrogen phosphate (H2PO4-) which are the forms plants can use. More info here |
January 22, 2015 | #4 |
Tomatovillian™
Join Date: Jan 2011
Location: S.E. Wisconsin Zone 5b
Posts: 1,831
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Thanks Ray and yes I agree with you that Phosphorous acid (H3PO3) when used in fungicides it is typically in a salt form. I supplied a link in my original post and stated that it provided more information.
Agri-Fos, which I purchased locally at an independent farm supply and feed store, states this on the label; Active Ingredients: Mono- and di-potassium salts of Phosphorous Acid 45.8% Other Ingredients 54.2% Monterey Aliette, the original Phosphorous acid based fungicide states this on the label; Active Ingredient – 0-Ethyl Phosphonate 80% Inert Ingredient – 20.0% Exel (Organic Laboratories), states this on the label; Active Ingredients: Dipotassium Phosphonate 20.40% Dipotassium Phosphate 22.67% Other Ingredients 56.93% Please see the attached scan of all three in the PDF file below. The point I was trying to make in my original post, was that changing a number by one in a formula even when the names are somewhat similar can have very different properties. Dutch
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"Discretion is the better part of valor" Charles Churchill The intuitive mind is a gift, and the rational mind is a faithful servant. But we have created a society that honors the servant and has forgotten the gift. (paraphrased) Albert Einstein I come from a long line of sod busters, spanning back several centuries. Last edited by Dutch; January 22, 2015 at 03:08 AM. Reason: Added info |
January 22, 2015 | #5 |
Tomatovillian™
Join Date: Jan 2011
Location: S.E. Wisconsin Zone 5b
Posts: 1,831
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Below I have attached a scan of Reliant. It was out in the garage and I didn’t want to go out there last night in the cool. This is the gallon size and the label is easier to read.
Dutch
__________________
"Discretion is the better part of valor" Charles Churchill The intuitive mind is a gift, and the rational mind is a faithful servant. But we have created a society that honors the servant and has forgotten the gift. (paraphrased) Albert Einstein I come from a long line of sod busters, spanning back several centuries. |
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