Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (28): 88-95.doi: 10.11924/j.issn.1000-6850.casb2020-0818

Special Issue: 烟草种植与生产

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Application and Safety Evaluation of Rimsulfuron in Flue-cured Tobacco Production

Zhou Wei1(), Xiang Deming2(), Tian Minghui2, Yang Hongwu3, Xiang Qingsong1, Teng Kai2, Rao Wei4   

  1. 1Fenghuang Branch of Xiangxi Autonomous Prefecture Tobacco Company, Fenghuang Hunan 416200
    2Xiangxi Autonomous Prefecture of Hunan Tobacco Company, Jishou Hunan 416000
    3Hunan Tobacco Company, Changsha 410005
    4Taoyuan Branch of Changde Tobacco Company, Taoyuan Hunan 415700
  • Received:2020-12-22 Revised:2020-08-13 Online:2021-10-05 Published:2021-10-28
  • Contact: Xiang Deming E-mail:zwxxyc@163.com;xdmycgs@163.com

Abstract:

The paper aims to further guide the application of the chemical herbicide rimsulfuron in flue-cured tobacco production. In this experiment, the directional spray method on tobacco stems and leaves was used to study the phytotoxicity to flue-cured tobacco caused by rimsulfuron, and evaluate its safety. We screened out two protective agents, Nai’an and Brassinolide, mixed them with rimsulfuron, and carried out protective experiments at the early stage of vigorous growth period. The results showed that 25% rimsulfuron could quickly produce the highest level of phytotoxicity to flue-cured tobacco, but the symptoms of phytotoxicity were short, and basically disappeared after 10 days of application, and disappeared after 15 days. The tobacco plants returned to normal growth, and the tobacco leaves at the mature stage had no drug residue. The two protective agents played a certain role in alleviating the phytotoxicity caused by rimsulfuron. The effect of Nai’an was better than that of brassinolide, however, the effect of both the agents on leaves directly exposed to the liquid medicine was not significant. The two protective agents reduced the control effect and duration of rimsulfuron on weeds. The appropriate concentration of rimsulfuron in tobacco production was 50-58.3 mg/kg. Once the tobacco plants showed obvious symptoms of phytotoxicity, Nai’an or brassinolide should be sprayed for protective restoration.

Key words: rimsulfuron, flue-cured tobacco, phytotoxicity, Nai’an;, brassinolide

CLC Number: