Abstract
Paclobutrazol (PBZ), a well-known growth retardant of the triazole family, is mostly used for controlling plant size and growth, resulting in more desirable compact plants for floricultural purposes; however, limited experimental data are available for use of PBZ in field sunflower. The objective of this study was to evaluate the effect of repeated foliar applications of PBZ at rates of 50 + 50 g ha-1(double application) and 50 + 50 + 50 g ha-1 (triple application) on sunflower morphology and productivity. PBZ applications corresponded to growth stages of four to five, five to six, and six to eight true leaves of sunflower plants, respectively. The double foliar application of PBZ reduced sunflower plant height at maturity by 4.4% (or by 11.7 cm). The triple foliar application of PBZ reduced sunflower plant height at maturity by 14.4% (or by 49.2 cm). However, PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control. Overall, the repeated foliar applications of PBZ at the rates tested in this study, apart from providing a reduction of sunflower plant height, had major adverse effects on achene yield and weight. Thus, different application schemes of PBZ or perhaps different growth regulators should be investigated to control plant height in sunflower.
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Claims 7
Claim · model-written summary
Double foliar PBZ application reduced sunflower plant height at maturity by 4.4%
- Taxon
- sunflower
Helianthus annuuse1 - Treatment
- double foliar application of PBZe1
- Outcome
- plant height at maturitye1
- Direction
- reducede1
- Value
- 4.4%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The double foliar application of PBZ reduced sunflower plant height at maturity by 4.4% (or by 11.7 cm)”
Claim · model-written summary
Triple foliar PBZ application reduced sunflower plant height at maturity by 14.4%
- Taxon
- sunflowerHelianthus annuuse2
- Treatment
- triple foliar application of PBZe2
- Outcome
- plant height at maturitye2
- Direction
- reducede2
- Value
- 14.4%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The triple foliar application of PBZ reduced sunflower plant height at maturity by 14.4% (or by 49.2 cm)”
Claim · model-written summary
Double PBZ application reduced achene yield per plant by 25.6%
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- double applicatione3
- Outcome
- achene yield per plante4
- Direction
- reducede4
- Value
- 25.6%e4
- Comparator
- non-treated controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower response to repeated foliar applications of Paclobutrazol”
e3“at rates of 50 + 50 g ha-1(double application) and 50 + 50 + 50 g ha-1 (triple application)”
e4“PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control”
Claim · model-written summary
Triple PBZ application reduced achene yield per plant by 22.5%
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- triple applicatione4
- Outcome
- achene yield per plante4
- Direction
- reducede4
- Value
- 22.5%e4
- Comparator
- non-treated controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower response to repeated foliar applications of Paclobutrazol”
e4“PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control”
Claim · model-written summary
Double PBZ application reduced 100-achene weight by 11.4%
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- double applicatione3
- Outcome
- 100-achene weighte4
- Direction
- reducede4
- Value
- 11.4%e4
- Comparator
- non-treated controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower response to repeated foliar applications of Paclobutrazol”
e3“at rates of 50 + 50 g ha-1(double application) and 50 + 50 + 50 g ha-1 (triple application)”
e4“PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control”
Claim · model-written summary
Triple PBZ application reduced 100-achene weight by 25.0%
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- triple applicatione4
- Outcome
- 100-achene weighte4
- Direction
- reducede4
- Value
- 25.0%e4
- Comparator
- non-treated controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sunflower response to repeated foliar applications of Paclobutrazol”
e4“PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control”
Claim · model-written summary
Different PBZ application schemes or other growth regulators should be investigated to control sunflower height
- Taxon
- sunflowerHelianthus annuuse5
- Outcome
- different application schemes of PBZ or perhaps different growth regulators should be investigatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Thus, different application schemes of PBZ or perhaps different growth regulators should be investigated to control plant height in sunflower”
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 →application · growth · Helianthus annuus (common sunflower)Positive and negative results
72 papers in the same direction as this paper · 8 in the opposite direction
- negative
- no effect
- no effect
77 papers more in this group
See all 81 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.