The Impact of Fluroxypyr Drift on Soybean Phytotoxicity and the Safety Drift Thresholds

Qingqing Zhou, Songchao Zhang, Tianqi Lin, Yuxuan Jiao, Chen Cai, Chenchen Xue, Jinwen Ye and Xinyu Xue ()
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Qingqing Zhou: Nanjing Institutes of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Songchao Zhang: Nanjing Institutes of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Tianqi Lin: Metering and Fluid Control Technology Research Center of Dongxing Energy, Wenzhou 325800, China
Yuxuan Jiao: Nanjing Institutes of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Chen Cai: Nanjing Institutes of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Chenchen Xue: Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Jinwen Ye: Nanjing Institutes of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Xinyu Xue: Nanjing Institutes of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China

Agriculture, 2024, vol. 14, issue 12, 1-14

Abstract: Maize–soybean intercropping can increase soybean yields and stabilize maize yields, and this practice has been widely promoted in China. Fluroxypyr is a recommended herbicide for maize seedlings, and its drift will cause phytotoxicity to neighboring soybean seedlings. A laboratory toxicity test was performed on soybeans by using a mobile bioassay spray tower. It showed that both the carrier volume and the drift deposition rate of fluroxypyr significantly influenced soybean fresh weight. The soybean fresh weight inhibition rate increased with the increase in the drift deposition rate, especially in the range of 1% to 6%, and soybean fresh weight decreased rapidly. The lack of fit R 2 was 0.6875, with a 9% maximum deviation between experimental values and simulated values. The drift deposition rate upper threshold for mild phytotoxicity (10% fresh weight inhibition rate, ED 10 ) was determined to be 3.35%, while the threshold for no phytotoxicity (0% fresh weight inhibition rate, ED 0 ) was 1.01%. To ensure soybean safety, isolation devices and anti-drift nozzles were installed on the boom sprayer to maintain drift below ED 0 or, at most, ED 10 . Maize seedling strip weed control field tests showed that the highest drift deposition rate was 0.689% under the carrier volume of 330 L·ha −1 . There was no phytotoxicity observed on soybeans after 21 days of application, which was consistent with laboratory research results. In this study, the phytotoxicity risk and safe thresholds for the fluroxypyr drift on soybean seedlings were established, which provide a theoretical basis for the safe production of soybeans.

Keywords: fluroxypyr; phytotoxicity; maize–soybean strip intercropping; drift deposition rate; inhibition rate (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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