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<blockquote data-quote="BPip" data-source="post: 7391037" data-attributes="member: 148500"><p>To follow up, a study was undertaken by the USA Vermont agency of Agriculture to confirm contamination effects from herbicide residues and the amount required to cause harm to subsequent crops via manure/dung/compost use.</p><p>There have even been market garden farmers who’ve used ‘gaden centre’ bagged compost and discovered contamination. Many of these bagged products come from composted household ‘green’ waste, with some home herbicides not suitable for food production plants)</p><p></p><p>Interesting to note the amount required to destroy subsequent crops are in parts per billion. So a very miniscule amount. Of course all manure ideally is composted so the forage based manure becomes a concentrated source of these herbicides.</p><p>(I’ve even mulched potatoes with hay and within the week the potatoes twisted, went yellow and died. So manure is concentrated hay and the effects are just as quick to destroy plants)</p><p></p><p>[URL unfurl="true"]https://www.nacaa.com/journal/index.php?jid=201[/URL]</p><p></p><p><strong>Table 3.</strong> Range of herbicide residue detected in submitted samples, amount necessary in compost to cause plant injury and label and use information of four persistent herbicidesa. </p><p></p><table style='width: 100%'><tr><td>Criteria</td><td>Picloram</td><td>Clopyralid</td><td>Aminopyralid</td><td>Aminocyclopyrachlor</td></tr><tr><td>Range detectedb at Testing Facility C</td><td>Trace<br /> ppb</td><td>Trace - 623<br /> ppb</td><td>Trace - 6.4<br /> ppb</td><td>0<br /> ppb</td></tr><tr><td>Levels Known to Cause Harm in Compostb</td><td>5 ppb</td><td>10 ppb</td><td>1 ppb</td><td>Unknown</td></tr><tr><td>Tolerance on Hayc</td><td>400,000 ppb</td><td>500,000 ppb</td><td>50,000 ppb</td><td>No food uses</td></tr><tr><td>Registered for use in VT</td><td>yes</td><td>yes</td><td>yes</td><td>no</td></tr><tr><td>Pounds used in Vermont in 2012</td><td>0.0</td><td>19.71</td><td>16.43</td><td>0.0</td></tr></table><p>aProducts are labeled as restricted use in Vermont.</p><p></p><p>bData gathered from VT-AG records.</p><p></p><p>cTolerance numbers published in General Register Code of Federal Regulations referring to allowable residue on a crop.</p></blockquote><p></p>
[QUOTE="BPip, post: 7391037, member: 148500"] To follow up, a study was undertaken by the USA Vermont agency of Agriculture to confirm contamination effects from herbicide residues and the amount required to cause harm to subsequent crops via manure/dung/compost use. There have even been market garden farmers who’ve used ‘gaden centre’ bagged compost and discovered contamination. Many of these bagged products come from composted household ‘green’ waste, with some home herbicides not suitable for food production plants) Interesting to note the amount required to destroy subsequent crops are in parts per billion. So a very miniscule amount. Of course all manure ideally is composted so the forage based manure becomes a concentrated source of these herbicides. (I’ve even mulched potatoes with hay and within the week the potatoes twisted, went yellow and died. So manure is concentrated hay and the effects are just as quick to destroy plants) [URL unfurl="true"]https://www.nacaa.com/journal/index.php?jid=201[/URL] [B]Table 3.[/B] Range of herbicide residue detected in submitted samples, amount necessary in compost to cause plant injury and label and use information of four persistent herbicidesa. [TABLE] [TR] [TD]Criteria[/TD] [TD]Picloram[/TD] [TD]Clopyralid[/TD] [TD]Aminopyralid[/TD] [TD]Aminocyclopyrachlor[/TD] [/TR] [TR] [TD]Range detectedb at Testing Facility C[/TD] [TD]Trace ppb[/TD] [TD]Trace - 623 ppb[/TD] [TD]Trace - 6.4 ppb[/TD] [TD]0 ppb[/TD] [/TR] [TR] [TD]Levels Known to Cause Harm in Compostb[/TD] [TD]5 ppb[/TD] [TD]10 ppb[/TD] [TD]1 ppb[/TD] [TD]Unknown[/TD] [/TR] [TR] [TD]Tolerance on Hayc[/TD] [TD]400,000 ppb[/TD] [TD]500,000 ppb[/TD] [TD]50,000 ppb[/TD] [TD]No food uses[/TD] [/TR] [TR] [TD]Registered for use in VT[/TD] [TD]yes[/TD] [TD]yes[/TD] [TD]yes[/TD] [TD]no[/TD] [/TR] [TR] [TD]Pounds used in Vermont in 2012[/TD] [TD]0.0[/TD] [TD]19.71[/TD] [TD]16.43[/TD] [TD]0.0[/TD] [/TR] [/TABLE] aProducts are labeled as restricted use in Vermont. bData gathered from VT-AG records. cTolerance numbers published in General Register Code of Federal Regulations referring to allowable residue on a crop. [/QUOTE]
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