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Glyphosate residues - David
David you may recall that soem time back we had a discussion here on
glyphosate residues - it arose from a post that was made by Sheldon and where I responded about how it seemed to leave residues that had an impact on roses. You asked if anyone had seen and 'real' info on any residues. The Jan/Feb 2013 (and yes, that 2013 date is correct) copy of the ABC 'Organic Gardener' mag has a response from Jerry C-W in the Q and A section about this very topic and he's given has lots of cites. It seems there is lots of well researched findings on the residues and he mentions which foods it can be found in which were grown a year after application. |
#2
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Glyphosate residues - David
Farm1 wrote:
David you may recall that soem time back we had a discussion here on glyphosate residues - it arose from a post that was made by Sheldon and where I responded about how it seemed to leave residues that had an impact on roses. You asked if anyone had seen and 'real' info on any residues. The Jan/Feb 2013 (and yes, that 2013 date is correct) copy of the ABC 'Organic Gardener' mag has a response from Jerry C-W in the Q and A section about this very topic and he's given has lots of cites. It seems there is lots of well researched findings on the residues and he mentions which foods it can be found in which were grown a year after application. Thanks. It looks like the article isn't on line. Any chance you could give me the references? David |
#3
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Glyphosate residues - David
"David Hare-Scott" wrote in message
... Farm1 wrote: David you may recall that soem time back we had a discussion here on glyphosate residues - it arose from a post that was made by Sheldon and where I responded about how it seemed to leave residues that had an impact on roses. You asked if anyone had seen and 'real' info on any residues. The Jan/Feb 2013 (and yes, that 2013 date is correct) copy of the ABC 'Organic Gardener' mag has a response from Jerry C-W in the Q and A section about this very topic and he's given has lots of cites. It seems there is lots of well researched findings on the residues and he mentions which foods it can be found in which were grown a year after application. Thanks. It looks like the article isn't on line. Any chance you could give me the references? There are 9 of them and they are all long URLs so it'd take me ages and you can see from my post above that my typing is very bad. Here's one but other than that it might be worth asking if your local library has a copy or can get it on InterLL. My local library gets it and I get them to get me lots of things on InterLL if I think I might want to buy it - these days I want to see stuff before I buy. US EPA Reregistration Eligibility decision (RED), Glyphosate, 1993:W:epa.gov/oppsrrd1/REDs/old_reds/glyphosate.pdf Oh gack! That's about as useful as boobs on a budgie but if you put that into google from 'epa' onwards, it will get you a download of the PDF, ( I hate them given my download speeds). If you really can't get the mag at your local Library let me know and I"ll plug through them over time for you when it's too hot to ge tout and garden. |
#4
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Glyphosate residues - David
On Thursday, December 13, 2012 4:07:00 PM UTC-8, Farm1 wrote:
David you may recall that soem time back we had a discussion here on glyphosate residues - it arose from a post that was made by Sheldon and where I responded about how it seemed to leave residues that had an impact on roses. You asked if anyone had seen and 'real' info on any residues. The Jan/Feb 2013 (and yes, that 2013 date is correct) copy of the ABC 'Organic Gardener' mag has a response from Jerry C-W in the Q and A section about this very topic and he's given has lots of cites. It seems there is lots of well researched findings on the residues and he mentions which foods it can be found in which were grown a year after application. while I have been hanging out in rec.gardens i noticed this question. I haven't researched glyphosate fate in soils directly but I have read some of the literature. glyposate is essentially a phosphonated amino acid. There are many bacterial strains that can completely degrade glyphosate to CO2, phosphate and amino acid. With the right genes bacteria eat glyphosate very well, as a carbon and energy source, as a P source and as an N source. However, in a soil that has not been previously exposed to glyphosate, it will take weeks to months to develop a microbial population that degrades glyphosate. Subsequent applications were found to be degraded quite rapidly and completely, within a week, IIRC. Also I was under the impression that glyphosate is an effective plant killer only in foliar application, but I may be wrong. Stuart PS: Best luck to the Aussies on the list in the threatened zones. So whether significant glyphosate would remain in a particular soil would depend |
#5
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Glyphosate residues - David
On Thursday, December 13, 2012 4:07:00 PM UTC-8, Farm1 wrote:
David you may recall that soem time back we had a discussion here on glyphosate residues - it arose from a post that was made by Sheldon and where I responded about how it seemed to leave residues that had an impact on roses. You asked if anyone had seen and 'real' info on any residues. The Jan/Feb 2013 (and yes, that 2013 date is correct) copy of the ABC 'Organic Gardener' mag has a response from Jerry C-W in the Q and A section about this very topic and he's given has lots of cites. It seems there is lots of well researched findings on the residues and he mentions which foods it can be found in which were grown a year after application. More message actions 6:18 PM (2 minutes ago) - show quoted text - while I have been hanging out in rec.gardens i noticed this question. I haven't researched glyphosate fate in soils directly but I have read some of the literature. glyposate is essentially a phosphonated amino acid. There are many bacterial strains that can completely degrade glyphosate to CO2, phosphate and amino acid. With the right genes bacteria eat glyphosate very well, as a carbon and energy source, as a P source and as an N source. However, in a soil that has not been previously exposed to glyphosate, it will take weeks to months to develop a microbial population that degrades glyphosate. Subsequent applications were found to be degraded quite rapidly and completely, within a week, IIRC. So whether significant glyphosate would remain in a particular soil would depend on whether the soil had been exposed to glyphosate previously. If it had (within a few years), the soil bacterial population probably would have sufficient copies of the glyphosate degradation pathway (only a couple genes) to degrade the chemical to undetectable. Also I was under the impression that glyphosate is an effective plant killer only in foliar application, but I may be wrong. Stuart PS: Best luck to the Aussies on the list in the threatened zones. |
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