UTJECAJ RETARDANTA RASTA NA RAST I RAZVOJ MAĆUHICE SVOJTE VIOLA × WITTROCKIANA

Pokus na maćuhici Viola × wittrockiana Gams. izveden je kao istraživački rad kojim je proučavan utjecaj retardanta rasta daminozida na dva kultivara maćuhice, višebojnom \u27Super Majestic Giants\u27 i ljubičastom \u27Crystal Bowl Supreme Purple\u27. Sadnice u posudama jednokratno su prskane sredstvom Alar 85 (F. John Kwizda Gesellschaft m. b. H.) u koncentracijama 3000 mgl-1 (150 biljaka) i 5000 mgl-1 (150 biljaka), u fazi 3-5 listova, 45 dana poslije sjetve. Kontrola i dvije koncentracije daminozida bile su zastupljene s 10 biljaka u 5 repeticija, što je za dva kultivara predstavljalo 300 biljaka sveukupno. Uzgoj je proveden u stakleniku na području grada Čakovca u dvije vegetacijske godine, 2003. i 2004. U postojećim uvjetima Alar nije statistički značajno uzrokovao usporeni rast stabljike tretiranih biljaka u odnosu na kontrolne biljke. Statistički signifikantna razlika u broju i promjeru cvjetova te broju cvjetova i pupova u drugoj godini pokusa može se pripisati razlikama između dva kultivara u pokusu.The research on pansy Viola × wittrockiana Gams. was carried out and the influence of PGR (plant growth retardant) daminozide on two cultivars of pansy, the multicolor \u27Super Majestic Giants\u27 and the purple \u27Crystal Bowl Supreme Purple\u27. The plants were treated with a single spray of Alar 85 (F. John Kwizda Gesellschaft m. b. H.), in concentrations of 3000 mgl-1 (150 plants) and 5000 mgl-1 (150 plants), 45 days after sowing, in 3-5 true leaves phase. 300 plants in bioassay were split into 5 repetitions. Each combination was represented by 10 plants. The plants were bred in a glasshouse in Čakovec during two vegetative years, 2003 and 2004. The treatment with Alar did not cause statistically significant smaller plant height, diameter and number of leaves as compared to the control group. A significant difference in flower number and diameter and the number of flowers and buds per plant in the second year was caused by the cultivars\u27 features and not by Alar