Root-zone Medium Influences Growth of Poinsettias Treated with Paclobutrazol-impregnated Spikes and Drenches

in HortScience
View More View Less
  • 1 Department of Plant and Soil Sciences, Mississippi Agricultural and Forestry Experiment Station, Box 9555, Mississippi State, MS 39762

An experiment was conducted to determine the influence of eight commercial root-zone media (four peat based and four pine bark based) on the effects of paclobutrazol applied to Euphorbia pulcherrima Willd. `Eckespoint Celebrate 2' as an impregnated spike or a drench. Paclobutrazol treatments had the least influence on stem elongation of poinsettias grown in the peat-based medium containing Bacctite, a compressed peat product designed to increase aeration and cation exchange capacity, or composted pine bark ground to a particle size that could pass through an opening 1 cm or smaller. Spikes were more effective at reducing shoot elongation than drenches. Spike treatments also resulted in lower bract dry-matter accumulation than drenches. Paclobutrazol applied as a spike to poinsettias at pinch could combine pinching and chemical growth regulator application into one simultaneous operation. Chemical name used: (±)-(R*,R*)-beta-[(4-chlorophenyl)methyl]-alpha-(1, 1,-dimethyl)-1H-1,2,4,-triazole-1-ethanol (paclobutrazol).

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 74 15 2
PDF Downloads 115 43 4