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Effect of irrigation and adjuvant on residual activity of pendimethalin and metazachlor in kohlrabi and soil

Author

Listed:
  • Miroslav Jursík

    (Department of Agroecology and Biometeorology, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • Martin Kočárek

    (Department of Soil Science and Soil Protection, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • Marie Suchanová

    (Department of Food Analysis and Nutrition, University of Chemistry and Technology Prague, Prague, Czech Republic)

  • Michaela Kolářová

    (Department of Agroecology and Biometeorology, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • Jaroslav Šuk

    (Department of Agroecology and Biometeorology, Czech University of Life Sciences in Prague, Prague, Czech Republic)

Abstract

Metazachlor and pendimethalin are the most used herbicides in kohlrabi. The main objectives of the present study were to evaluate the residual activity of herbicides pendimethalin and metazachlor in kohlrabi and soil under different irrigation regimes and to evaluate the effect of soil adjuvants on the residual activity of tested herbicides. Pendimethalin dissipation half-life (17.3-38.3 days) was higher than metazachlor dissipation half-life (12.1-16.8 days). The pendimethalin half-life was not affected by an adjuvant, irrigation, and an experimental year. Pendimethalin mobility in the soil was affected more by natural precipitation than by irrigation. The use of adjuvant did not affect pendimethalin leaching in dry weather conditions. In wetter natural conditions, a higher pendimetha-lin leaching was found at early-irrigated plots treated by an adjuvant (9.39% of the applied dose was detected in the soil layer 5-10 cm). Metazachlor dissipation half-life was not affected both by an adjuvant and by irrigation. In the soil layer 5-10 cm, metazachlor was detected only in 2016 on intensively irrigated plots without the use of adjuvant (0.072 µg/g). A concentration of pendimethalin in kohlrabi tubers ranged between 2 and 7 µg/kg. The highest concentration of pendimethalin was detected in tubers, which were intensively irrigated shortly after the application of herbicides without an adjuvant, especially when natural precipitation was high. Metazachlor was not detected in any of the tested kohlrabi samples.

Suggested Citation

  • Miroslav Jursík & Martin Kočárek & Marie Suchanová & Michaela Kolářová & Jaroslav Šuk, 2019. "Effect of irrigation and adjuvant on residual activity of pendimethalin and metazachlor in kohlrabi and soil," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 65(8), pages 387-394.
    • Handle: RePEc:caa:jnlpse:v:65:y:2019:i:8:id:171-2019-pse
    DOI: 10.17221/171/2019-PSE
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    References listed on IDEAS

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    1. S. Tandon, 2015. "Dissipation kinetics and residues analysis of pendimethalin in soil and maize under field conditions," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 61(11), pages 496-500.
    2. Martin KOČÁREK & Haytbay ARTIKOV & Karel VOŘÍŠEK & Luboš BORŮVKA, 2016. "Pendimethalin degradation in soil and its interaction with soil microorganisms," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 11(4), pages 213-219.
    3. M. Jursík & M. Kočárek & K. Hamouzová & J. Soukup & V. Venclová, 2013. "Effect of precipitation on the dissipation, efficacy and selectivity of three chloroacetamide herbicides in sunflower," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(4), pages 175-182.
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