Abstract
Drench applications of plant growth retardant paclobutrazol were applied at 2, 4, 8, 16, or 32 mg a.i./pot, plus an untreated control to pot sunflowers ( Helianthus annuus cv. `Pacino') to determine its effect as a chemical height control. All paclobutrazol concentrations applied significantly reduced plant height by »27% when compared to the untreated control, but excessively short plants were observed at 16 and 32 mg a.i./pot. Plant diameter was also significantly decreased by »16% at 2 and 4 mg a.i./pot of paclobutrazol, when compared to the untreated control. Flower diameter decreased by »4% at 2 and 4 mg a.i./pot of paclobutrazol, but only concentrations ≥4 mg a.i./pot were significantly different from the untreated control. Paclobutrazol concentrations had no effect on days from potting to flowering. Drench concentrations of 2 and 4 mg a.i./pot of paclobutrozol produced optimum height control in relation to 16.5-cm-diameter pot size used.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
All tested paclobutrazol doses reduced height by about 27% versus untreated plants.
- Taxon
- Helianthus annuus
Helianthus annuuse1 - Treatment
- paclobutrazol concentrationse0
- Outcome
- plant heighte0
- Direction
- reducede0
- Value
- »27%e0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All paclobutrazol concentrations applied significantly reduced plant height by »27% when compared to the untreated control”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
Claim · model-written summary
Doses of 16 and 32 mg per pot produced excessively short plants.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- 16 and 32 mg a.i./pote0
- Outcome
- excessively short plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessively short plants were observed at 16 and 32 mg a.i./pot”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
Claim · model-written summary
At 2 and 4 mg per pot, paclobutrazol significantly decreased plant diameter by about 16%.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- 2 and 4 mg a.i./pot of paclobutrazole0
- Outcome
- Plant diametere0
- Direction
- decreasede0
- Value
- »16%e0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant diameter was also significantly decreased by »16% at 2 and 4 mg a.i./pot of paclobutrazol, when compared to the untreated control”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
Claim · model-written summary
Flower diameter decreased by about 4% at 2 and 4 mg per pot.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- 2 and 4 mg a.i./pot of paclobutrazole0
- Outcome
- Flower diametere0
- Direction
- decreasede0
- Value
- »4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flower diameter decreased by »4% at 2 and 4 mg a.i./pot of paclobutrazol”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
Claim · model-written summary
Flower diameter differed significantly from controls only at doses of at least 4 mg per pot.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- concentrations ≥4 mg a.i./pote0
- Outcome
- Flower diametert1
- Comparator
- untreated controle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only concentrations ≥4 mg a.i./pot were significantly different from the untreated control”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
t1“Flower diameter”
Claim · model-written summary
Paclobutrazol did not change days from potting to flowering.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- Paclobutrazol concentrationse0
- Outcome
- days from potting to floweringe0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paclobutrazol concentrations had no effect on days from potting to flowering”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
Claim · model-written summary
The authors identified 2 and 4 mg per pot as optimal height-control doses for 16.5-cm pots.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- 2 and 4 mg a.i./pot of paclobutrozole0
- Outcome
- optimum height controle0
- Qualifier
- 16.5-cm-diameter pot sizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drench concentrations of 2 and 4 mg a.i./pot of paclobutrozol produced optimum height control in relation to 16.5-cm-diameter pot size used”
t0“Potted Sunflowers Grown in 16.5-cm Pots”
e1“pot sunflowers ( Helianthus annuus cv. `Pacino')”
The same questions in other papers
paclobutrazol · growth · Helianthus annuus (common sunflower)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
6 papers more in this group
See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.