Research was conducted to determine the relationship between surfactant properties and plant species (common lambsquarters, green foxtail, kochia, redroot pigweed, and sunflower) on primisulfuron phytotoxicity. Primisulfuron phytotoxicity was enhanced by all surfactants. Only surfactant HLB consistently related to enhancement of Beacon phytotoxicity. Optimum HLB values varied from 11.5 to 17.9 depending on plant species and surfactant chemistry. Surfactants having similar HLB values but different chemistry differed in their enhancement of Beacon phytotoxicity to various species. Surfactant enhancement of Beacon varied with plant species, even when surfactants had similar HLB values. The data indicate that plant species, surfactant chemistry, and surfactant HLB influence surfactant enhancement of Beacon phytotoxicity.
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