PLANT GROWTH MODIFICATION AND WATER USE OF HIBISCUS ROSA-SINENSIS `BRILLIANT' PLANTS BY UNICONAZOLE WITH VARIOUS COMBINATIONS OF PLANT GROWTH REGULATORS

• Published in: HortScience Vol. 25; no. 9; p. 1125
• Main Authors: Sanabria, L.G., Newman, S.E.
• Format: Journal Article
• Language: English
• Published: 01.09.1990
• ISSN: 0018-5345; 2327-9834
• DOI: 10.21273/HORTSCI.25.9.1125e

Various uniconazole (Sumagic™) rates were either sprayed or drenched alone or in combination with 6-BA and GA 4+7 (Promalin™) or dikegulac-sodium (Atrinal™) on Hibiscus rosa-sinensis `Brilliant'. The rates of uniconazole were 0, 5, 10, and 15 mg a.i./L; 6-BA and GA 4+7 , 25 mg a.i./L each; and dikegulac-sodium 1000 mg a.i./L. Plant height was reduced by uniconazole when drenched at rates as low as 5 mg/L and 15 mg/L when sprayed. Dikegulac-sodium slightly counteracted the effects of uniconazole. Uniconazole activity was increased when either sprayed or drenched with application of 6-BA and GA 4+7 resulting in greater height reduction. Transpiration and stomatal diffusive resistance of plants drenched with uniconazole alone was erratic; however, when uniconazole was sprayed or drenched and mixed with 6–BA and GA 4+7 or dikegulac-sodium transpiration increased.