Plant-Back Intervals of Imicyafos Based on Its Soil Dissipation and Plant Uptake for Rotational Cultivation of Lettuce and Spinach in Greenhouse

Da-Jung Lim, Seon-Wook Kim, Young-Eun Kim, Ji-Hyun Yoon, Hyun-Jeong Cho, Byeung-Gon Shin, Hyo-Young Kim and In-Seon Kim
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Da-Jung Lim: Department of Agricultural Chemistry, College of Agriculture and Life Sciences, Chonnam National University, Yongbong-ro 77, Gwangju 61186, Korea
Seon-Wook Kim: Department of Agricultural Chemistry, College of Agriculture and Life Sciences, Chonnam National University, Yongbong-ro 77, Gwangju 61186, Korea
Young-Eun Kim: Department of Agricultural Chemistry, College of Agriculture and Life Sciences, Chonnam National University, Yongbong-ro 77, Gwangju 61186, Korea
Ji-Hyun Yoon: Department of Agricultural Chemistry, College of Agriculture and Life Sciences, Chonnam National University, Yongbong-ro 77, Gwangju 61186, Korea
Hyun-Jeong Cho: Experimental Research Institute, National Agricultural Products Quality Management Service, Yongjeon-ro 141, Gyeongbuk 39660, Korea
Byeung-Gon Shin: Experimental Research Institute, National Agricultural Products Quality Management Service, Yongjeon-ro 141, Gyeongbuk 39660, Korea
Hyo-Young Kim: Experimental Research Institute, National Agricultural Products Quality Management Service, Yongjeon-ro 141, Gyeongbuk 39660, Korea
In-Seon Kim: Department of Agricultural Chemistry, College of Agriculture and Life Sciences, Chonnam National University, Yongbong-ro 77, Gwangju 61186, Korea

Agriculture, 2021, vol. 11, issue 6, 1-10

Abstract: The plant-back intervals (PBIs) of imicyafos were investigated for rotational cultivation of lettuce and spinach in greenhouses. Imicyafos dissipation in soil and its plant uptake were evaluated by liquid chromatography-tandem mass spectrometry. Bioconcentration ratios (BCRs) were calculated by comparing the residues in plants to the initial residue in soil. The BCRs were used to calculate the soil acceptable residues (SARs) transferable to plants at the Positive List System (PLS) level. The number of days, PBIs for reaching SARs were obtained from the dissipation equation for imicyafos in soil. In soil, imicyafos followed first order dissipation kinetics (R 2 = 0.975) with a half-life of 40.8 days. The BCRs ranged from 0.041 to 0.469 in the edible leaf parts of lettuce and 0.006 to 0.134 in those of spinach. The SARs ranged from 0.021 to 0.244 for lettuce and 0.075 to 1.667 mg kg −1 for spinach. The PBIs of imicyafos were estimated to be 213.9 to 357.3 days for lettuce and 100.8 to 283.6 days for spinach. This study suggests at least a minimum 1-year interval after the final application of imicyafos as a management method that complies with the PLS for the rotational cultivation of lettuce and spinach.

Keywords: imicyafos; pesticide; plant-back interval; positive list system; rotational crop (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: 2021
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