Plant Soil Environ., 2018, 64(7):324-329 | DOI: 10.17221/213/2018-PSE

Effect of using selected growth regulators to reduce sunflower stand heightOriginal Paper

Tomáš SPITZER*,1, Jan BÍLOVSKÝ1, Jan KAZDA2
1 Agrotest Fyto, Ltd., Kroměříž, Czech Republic
2 Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic

Influence of plant growth regulators chlormequat chloride, chlormequat chloride + ethephon, ethephon, and mepiquat chloride + prohexadione-Ca + pyraclostrobin + ammonium sulphate (BAS67800F + BAS00800D) on decreasing sunflower height was evaluated. It was determined that sunflower height can be reduced by as much as 30 cm. In the case of BAS67800F + ammonium sulphate, there was a slight difference between application at BBCH 31-33 and BBCH 50-51, whereas for ethephon better application time was at BBCH 50-51. For chlormequat chloride, application at BBCH 31-33 was better, but height reduction did not endure until harvest. Flower head diameter shortly before harvest was not affected at any tested regulator. Flowering was delayed primarily at applications at BBCH 50-51.

Keywords: Helianthus annuus; shoot growth; phytohormone; shortening; wind damage

Published: July 31, 2018  Show citation

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SPITZER T, BÍLOVSKÝ J, KAZDA J. Effect of using selected growth regulators to reduce sunflower stand height. Plant Soil Environ. 2018;64(7):324-329. doi: 10.17221/213/2018-PSE.
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