BY:Phil J. Petersen, Lloyd C. Haderlie, Raymond H.
Hoefer and Ray S. McAllister
Absorption and translocation of 14C-dicamba (3,6-dichloro-o-anisic acid) in seven salt formulations were determined 60 h after application to leaves of soybean [Glycine max (L.) Merr. "Williams"] grown in nutrient solution. The dimethylamine (DMA) formulation was consistently absorbed and retained in the plant in amounts equal to or greater (46% of recovered ¹⁴C) than other formulations (which averaged 19% of recovered 14C) when applied without surfactant. Absorption and subsequent retention of the DMA formulation in the plant was least affected of all formulations by the addition of a surfactant. With a surfactant, absorption of the DNA, monoethanolamine (MEA), and inorganic salt formulations was similar (>75% of recovered ¹⁴C). Addition of seven surfactants to the K-salt of dicamba increased both the amount of 14C absorbed by 35 to 56% and the amount recovered in the plant. All surfactants except one enhanced absorption of the K-salt of dicamba to a similar degree.
Dicamba exhibited predominantly symplastic translocation with
the majority of 14C being recovered in the new second trifoliolate leaves and
nutrient solution. As much as 66% of the radioactivity absorbed through the
leaves was exuded by roots into the nutrient solution 60 h after leaf treatment.
Absorption and translocation of 14C-dicamba (3,6-dichloro-o-anisic acid) in seven salt formulations were determined 60 h after application to leaves of soybean [Glycine max (L.) Merr. "Williams"] grown in nutrient solution. The dimethylamine (DMA) formulation was consistently absorbed and retained in the plant in amounts equal to or greater (46% of recovered ¹⁴C) than other formulations (which averaged 19% of recovered 14C) when applied without surfactant. Absorption and subsequent retention of the DMA formulation in the plant was least affected of all formulations by the addition of a surfactant. With a surfactant, absorption of the DNA, monoethanolamine (MEA), and inorganic salt formulations was similar (>75% of recovered ¹⁴C). Addition of seven surfactants to the K-salt of dicamba increased both the amount of 14C absorbed by 35 to 56% and the amount recovered in the plant. All surfactants except one enhanced absorption of the K-salt of dicamba to a similar degree.
Dicamba exhibited predominantly symplastic translocation with
the majority of 14C being recovered in the new second trifoliolate leaves and
nutrient solution. As much as 66% of the radioactivity absorbed through the
leaves was exuded by roots into the nutrient solution 60 h after leaf treatment. Yangzhou pioneer chemical CO.,LTD
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