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Management of sunflower stand height using growth regulators

Author

Listed:
  • T. Spitzer

    (Agrotest fyto, Ltd., Kroměříž, Czech Republic)

  • P. Matušinský

    (Agrotest fyto, Ltd., Kroměříž, Czech Republic)

  • Z. Klemová

    (Agrotest fyto, Ltd., Kroměříž, Czech Republic)

  • J. Kazda

    (Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resource, Czech University of Life Sciences Prague, Prague, Czech Republic)

Abstract

Influence of growth regulators chlormequat chloride, ethephon, trinexapac-ethyl, and a combination of chlormequat chloride and ethephon on decreasing sunflower height was examined in the years 2006-2009. Height was reduced by as much as 63 cm by double application of chlormequat chloride (915 g/ha) + ethephon (465 g/ha) at early and later growth stage (BBCH 32 and 50). Trinexapac-ethyl (375 g/ha) did not affect the height. One-time application of chlormequat chloride (1440-2160 g/ha), chlormequat chloride (458 g/ha) + ethephon (233 g/ha) (BBCH 30 or 50), or ethephon (480 g/ha) (BBCH 30) was sufficient for a ca 30 cm reduction during flowering, but this effect did not last until harvest. With double application (BBCH 30 and 50), reduction lasted until harvest. For ethephon (480 g/ha), application at BBCH 50 reduced height by as much as 35 cm and lasted until harvest. Combining a lower rate of ethephon with ammonium sulfate was effectively equivalent to using a full rate. Flower head diameter at maturity showed no significant negative influence compared to the control. In 2008 and 2009, a delay in flowering onset was observed after applying growth regulators.

Suggested Citation

  • T. Spitzer & P. Matušinský & Z. Klemová & J. Kazda, 2011. "Management of sunflower stand height using growth regulators," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(8), pages 357-363.
    • Handle: RePEc:caa:jnlpse:v:57:y:2011:i:8:id:75-2011-pse
    DOI: 10.17221/75/2011-PSE
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    Citations

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    Cited by:

    1. Tomáš SPITZER & Petr MÍŠA & Jan BÍLOVSKÝ & Jan KAZDA, 2015. "Management of maize stand height using growth regulators," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 51(4), pages 223-230.
    2. Tomáš Spitzer & Jan Bílovský, 2017. "Management of poppy (Papaver somniferum L.) stand height using growth regulators," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 53(1), pages 55-60.
    3. Tomáš SPITZER & Jan BÍLOVSKÝ & Jan KAZDA, 2018. "Effect of using selected growth regulators to reduce sunflower stand height," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(7), pages 324-329.

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