Efficacy and Phytotoxicity Trial of Different Dosages of 4% Nicosulfuron SC on Weeds in Corn Fields.

[Objective] The paper was to study efficacy and phytotoxicity of different dosages of 4% nicosulfuron on weeds in corn fields. [Method] With summer corn variety Zhengdan 958 commonly used in field production in Hengshui area of Hebei Province of China as the test material, different dosages (1 050, 1 500 and 1 950 mL /hm²) of corn postemergence herbicide 4% nicosulfuron SC were sprayed during five-leaf stage of corn, and the treatments with water spraying and manual weeding were set as controls. The effects of different dosages of 4% nicosulfuron SC on weed control efficacy and safety and yield of corn were analyzed in order to determine the optimal dosage. [Result] Spraying 4% nicosulfuron SC with dosage of 1 500 mL /hm² during five-leaf stage of corn not only had better control effect against various weeds, but also did not produce phytotoxicity on corn, and the yield of corn was higher. [Conclusion] The study provided scientific information for using 4% nicosulfuron to eradicate weeds in corn fields. [ABSTRACT FROM AUTHOR]