Soil bioassay of picloram residues from various field research plots
TL;DRAbstract
In the first experiment the roller applicator was used to apply picloram at two heights and three concentrations to leafy spurge in the summer and fall of 1981. The high treatments touched the top half of the leafy spurge plants and the low treatment touched 75 to 90% of the plant. The summer treatments were applied on 8 July 1981 when the weather was 72o F, with 38% relative humidity and the soil was dry. The fall applications were made on 1 September 1981 when the leafy spurge had resumed growth following fall rains. The temperature was 74o F with 52% relative humidity and the soil was 74o F at one inch. Soil samples were taken 14 and 6 weeks after application for the slimmer and fall treatments, respectively, and all leafy spurge topgrowth was dead.
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In the first experiment the roller applicator was used to apply picloram at two heights and three concentrations to leafy spurge in the summer and fall of 1981. The high treatments touched the top half of the leafy spurge plants and the low treatment touched 75 to 90% of the plant. The summer treatments were applied on 8 July 1981 when the weather was 72o F, with 38% relative humidity and the soil was dry. The fall applications were made on 1 September 1981 when the leafy spurge had resumed growth following fall rains. The temperature was 74o F with 52% relative humidity and the soil was 74o F at one inch. Soil samples were taken 14 and 6 weeks after application for the slimmer and fall treatments, respectively, and all leafy spurge topgrowth was dead.
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