Abstract
The guava is a fruit of strong economic and social relevance, regionally projected and greatly important in some regions of Brazil. The chemical thinning has been adopted in some fruit trees to obtain greater caliber of fruits and better prices. However, some aspects still need to be investigated for the safe and economical viability use of such technique. This research aimed to evaluate the chemical thinning efficiency, production and commercial classification of guava fruits cv. Paluma and provide an economic analysis of this crop system. The ethephon and benzyladenine were applied to fruits with an average size of 18 mm at 0, 150, 300 and 450 mg L-1. The trial was carried out in two crop seasons, and the randomized block design was used as statistical model in a factorial arrangement 2x4. The economic analysis was calculated through total production operational cost, in order to determine gross revenue, net revenue, profitability index, equilibrium price and yield. The benzyladenine and ethephon promoted the highest percentage of thinning fruits at 450 mg L-1, with averages of 67.6% and 70.0%, respectively. However, benzyladenine had a phytotoxic effect when applied at highest concentrations, 300 and 450 mg L-1, respectively. The ethephon enabled greater production of larger caliber fruits in the highest concentration (450 mg L-1). Chemical thinning reduced total operational cost and increased net revenue by 7.57%, as compared to hand thinning. Results also presented that chemical fruit thinning provided equilibrium yield of 4.98 t ha-1 for ‘Paluma’ guava fruit, as fresh fruit.
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Claims 7
Claim · model-written summary
Benzyladenine at 450 mg L-1 gave the highest percentage of thinned fruits, 67.6%.
- Taxon
- guava
Psidium guajavae0 - Material
- Palumae0
- Treatment
- benzyladeninee1
- Outcome
- percentage of thinning fruitse1
- Direction
- higheste1
- Value
- 67.6%e1
- Qualifier
- at 450 mg L-1e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e1“The benzyladenine and ethephon promoted the highest percentage of thinning fruits at 450 mg L-1, with averages of 67.6% and 70.0%, respectively”
Claim · model-written summary
Ethephon at 450 mg L-1 gave the highest percentage of thinned fruits, 70.0%.
- Taxon
- guavaPsidium guajavae0
- Material
- Palumae0
- Treatment
- ethephone1
- Outcome
- percentage of thinning fruitse1
- Direction
- higheste1
- Value
- 70.0%e1
- Qualifier
- at 450 mg L-1e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e1“The benzyladenine and ethephon promoted the highest percentage of thinning fruits at 450 mg L-1, with averages of 67.6% and 70.0%, respectively”
Claim · model-written summary
Benzyladenine had a phytotoxic effect when applied at the highest concentrations.
- Taxon
- guavaPsidium guajavae0
- Treatment
- benzyladeninee2
- Outcome
- phytotoxic effecte2
- Qualifier
- when applied at highest concentrations, 300 and 450 mg L-1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e2“benzyladenine had a phytotoxic effect when applied at highest concentrations, 300 and 450 mg L-1, respectively”
Claim · model-written summary
Ethephon at 450 mg L-1 gave greater production of larger caliber fruits.
- Taxon
- guavaPsidium guajavae0
- Treatment
- ethephone3
- Outcome
- production of larger caliber fruitse3
- Direction
- greatere3
- Qualifier
- in the highest concentration (450 mg L-1)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e3“The ethephon enabled greater production of larger caliber fruits in the highest concentration (450 mg L-1)”
Claim · model-written summary
Chemical thinning reduced total operational cost compared with hand thinning.
- Taxon
- guavaPsidium guajavae0
- Treatment
- Chemical thinninge4
- Outcome
- total operational coste4
- Direction
- reducede4
- Comparator
- hand thinninge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e4“Chemical thinning reduced total operational cost and increased net revenue by 7.57%, as compared to hand thinning”
Claim · model-written summary
Chemical thinning increased net revenue by 7.57% compared with hand thinning.
- Taxon
- guavaPsidium guajavae0
- Treatment
- Chemical thinninge4
- Outcome
- net revenuee4
- Direction
- increasede4
- Value
- 7.57%e4
- Comparator
- hand thinninge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e4“Chemical thinning reduced total operational cost and increased net revenue by 7.57%, as compared to hand thinning”
Claim · model-written summary
Chemical fruit thinning provided an equilibrium yield of 4.98 t ha-1.
- Taxon
- guavaPsidium guajavae0
- Treatment
- chemical fruit thinninge5
- Outcome
- equilibrium yielde5
- Value
- 4.98 t ha-1e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“guava fruits cv. Paluma”
e5“chemical fruit thinning provided equilibrium yield of 4.98 t ha-1”
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See all 70 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.