Abstract. Gibberellin A₃ 10 mg·dm^-3, flurprimidol 7.5 mg·dm^-3, chlormequat 2300 mg·dm^-3 increased the abundance of flowers, but the flowers sprayed with flurprimidol had the smallest flowers. The plants sprayed with chlormequat proved to have the highest decorative value.

The efect of growth regulators on flowering
and decorative value of NGI (Impatiens hawkeri W. Bull) belonging to Riviera group

Summary

The aim of the experiments conducted in the years 2001-2002 was to examine the effects of three growth regulators belonging to gibberellins and retardants on the abundance of flowering, the size of flowers and decorative value of NGI. The cultivars ‘Riviera Deep Salmon’ and ‘Riviera Pink’ were the plant material. Growth regulators were sprayed at the following concentrations: gibberellin A₃ – 10 mg·dm^-3, flurprimidol – 7.5 mg·dm^-3, chlormequat – 2300 mg·dm^-3. Control plants were not sprayed.

All the applied growth regulators increased the abundance of flowers, but the plants sprayed with flurprimidol had the smallest flowers. No effect of growth regulators on early flowering was observed. The plants sprayed with chlormequat proved to have the highest decorative value, mainly by improving the plant appearance in late summer and autumn. The worst results were found in NGI sprayed with flurprimidol, they had small, frequently deformed flowers and disproportionate conformation.