Paclobutrazol drench activity not affected in sphagnum peat-based substrates amended with pine wood chip aggregates

W. Garrett Owen, Brian E. Jackson, Brian E. Whipker, William C. Fonteno

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Processed pine (Pinus sp.) wood has been investigated as a component in horticultural substrates (greenhouse and nursery) for many years. Specifically, pine wood chips (PWC) have been uniquely engineered/processed into a nonfiberous blockular particle size, suitable for use as a substrate aggregate. The purpose of this research was to determine if paclobutrazol drench efficacy is affected by PWC used as a substitute for perlite in a peat-based substrate. Paclobutrazol drench applications of 0, 1, 2, and 4 mg/potwere applied to ‘PacinoGold’ sunflower (Helianthus annuus); 0.0, 0.25, 0.50, and 1.0 mg/pot to ‘Anemone Safari Yellow’marigold (Tagetes patula); and 0.0, 0.125, 0.25, and 0.50 mg/pot to ‘Variegata’ plectranthus (Plectranthus ciliates) grown in sphagnum peat-based substrates containing 10%, 20%, or 30% (by volume) perlite or PWC. Efficacy of paclobutrazol drenches for controlling growth of all three species was unaffected by substrate composition. We concluded that substitutingPWCfor perlite as an aggregate in peat-based substrates should not reduce paclobutrazol drench efficacy, variability in PWC products indicates that efficacy should be tested before large-scale use. The variability results from wood components not being engineered and processed the same across manufacturers, meaning that they are often incapable of improving/influencing the physical and chemical behavior of a substrate similarly.

Original languageEnglish
Pages (from-to)156-163
Number of pages8
JournalHortTechnology
Volume26
Issue number2
DOIs
StatePublished - Apr 2016

Bibliographical note

Publisher Copyright:
© 2016 by the American Society for Horticultural Science.

Keywords

  • Horticultural substrates
  • Loblolly pine
  • PGR
  • Plant growth regulator
  • Potting media

ASJC Scopus subject areas

  • Horticulture

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