Picloram residue levels for the control of leafy spurge regrowth

Picloram residue levels for the control of leafy spurge regrowth

The persistence of picloram was measured in the soil following a single application of 2.24 kg/ha and four consecutive annual applications of 0.56 kg/ha for the control of leafy spurge. The concentration of picloram in the surface 7.5 cm of soil decreased from 820 ppb immediately following the appli...

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Veröffentlicht in:Canadian journal of plant science 1981-01, Vol.61 (3), p.661-664
Hauptverfasser: Grover, R, Bowes, G.G
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Sprache:eng
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Euphorbia esula
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container_title Canadian journal of plant science
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creator Grover, R
Bowes, G.G
description The persistence of picloram was measured in the soil following a single application of 2.24 kg/ha and four consecutive annual applications of 0.56 kg/ha for the control of leafy spurge. The concentration of picloram in the surface 7.5 cm of soil decreased from 820 ppb immediately following the application of 2.24 kg/ha to range between 17 and 52 ppb in the third year after treatment. Picloram residues ranged between 45 and 165 ppb during each of the 4-yr periods of annual applications of 0.56 kg/ha. The critical level of picloram that must remain in the soil to prevent leafy spurge re-establishment from seed is about 50 ppb.
doi_str_mv 10.4141/cjps81-091
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subjects Euphorbia esula
title Picloram residue levels for the control of leafy spurge regrowth
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