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Dissipation of Pendimethalin in Soybean Crop Under Field Conditions

Abstract

Persistence of pendimethalin was studied in soil, soybean pods, straw and water under field conditions. Pendimethalin was applied at 1 and 2 kg a.i. ha−1. Residues in soil were detected up to 60 and 90 days at the recommended and double dose, respectively. Dissipation followed first order kinetics and was accounted for by a biphasic pattern. The half-life for the initial phase and later phase was 12.73 and 26.60 days, respectively, for recommended and 7.25 and 37.91 days, respectively, for double dose. The limit of quantification was 0.005 µg g−1 of sample. Percent recovery from soil, oil, defatted cake, straw and water samples fortified with 0.01–1.0 mg kg−1 varied from 84.5 %–89.6 %, 84.6 %–88.7 %, 79.4 %–86.0 %, 78.2 %–85.6 % and 90.2 %–93.0 %, respectively. At harvest, pendimethalin residue in soybean pods, straw, and soil were below detectable limits. No residues of pendimethalin were detected in ground water. Current application of pendimethalin in the environment is not expected to cause adverse health effects form the consumption of soybeans.

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Acknowledgments

Analytical grade pendimethalin provided by M/s American Cyanamid Ltd, USA (Now BASF) and formulation by M/s Gharda Chemicals, Mumbai, India is duly acknowledged.

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Correspondence to Shishir Tandon.

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Tandon, S. Dissipation of Pendimethalin in Soybean Crop Under Field Conditions. Bull Environ Contam Toxicol 96, 694–698 (2016). https://doi.org/10.1007/s00128-016-1764-0

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Keywords

  • Residue analysis
  • HPLC
  • Glycine max
  • Soil
  • Persistence