Abstract
Prohexadione calcium (P-Ca) has been reported to effectively control shoot growth in several pear cultivars, but with a few reports about its efficiency under the climatic conditions of southern Brazil. Therefore, the objective of this study was to evaluate vegetative growth, production, and fruit quality of ‘Smith’ pear trees in response to the use of different rates of P-Ca in the climatic conditions of southern Brazil. The experiment was conducted during the 2013/2014 and 2014/2015 seasons, in a 6-year-old ‘Smith’ pear orchard, trained to a central-leader system, with spacing of 1.5 × 4.8 m, grafted onto Pyrus calleryana Decne. Different P-Ca rates were applied (100, 200, 300, and 400 mg∙L–1) in different stages: first, in early spring for all treatments, and the others when shoot growth resumed (GR), but only for some treatments. Variables for vegetative growth, yield components and fruit quality at harvest and post-harvest were evaluated. The use of P-Ca was effective to control vegetative growth in both seasons, at different rates. Yield components were not affected by P-Ca applications in 2013/2014, except return bloom and return yield. In 2014/2015 season, P-Ca applications positively affected yield components, except average fruit weight and return bloom. P-Ca applications did not alter the qualitative attributes of the fruits of ‘Smith’ pear trees at harvest and after a period of cold storage. These results implicate P-Ca as a potential tool to manage vigor of ‘Smith’ pear trees in climatic conditions of southern Brazil.
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Claims 9
Claim · model-written summary
P-Ca controlled vegetative growth in both seasons at different rates.
- Taxon
- ‘Smith’ pear treest0
- Treatment
- P-Cae0
- Outcome
- vegetative growthe0
- Direction
- controle0
- Qualifier
- both seasonse0
Not reportedComparator
Verbatim
t0“‘Smith’ pear trees”
e0“The use of P-Ca was effective to control vegetative growth in both seasons, at different rates.”
Claim · model-written summary
P-Ca did not affect yield components in 2013/2014 apart from return bloom and return yield.
- Taxon
- ‘Smith’ pear treest0
- Treatment
- P-Ca applicationse0
- Outcome
- Yield componentse0
- Direction
- not affectede0
- Qualifier
- in 2013/2014, except return bloom and return yielde0
Not reportedComparator
Verbatim
t0“‘Smith’ pear trees”
e0“Yield components were not affected by P-Ca applications in 2013/2014, except return bloom and return yield.”
Claim · model-written summary
P-Ca affected return bloom in 2013/2014.
Not reportedComparatorDirection
Verbatim
t0“‘Smith’ pear trees”
e0“Yield components were not affected by P-Ca applications in 2013/2014, except return bloom and return yield.”
Claim · model-written summary
P-Ca affected return yield in 2013/2014.
Not reportedComparatorDirection
Verbatim
t0“‘Smith’ pear trees”
e0“Yield components were not affected by P-Ca applications in 2013/2014, except return bloom and return yield.”
Claim · model-written summary
P-Ca positively affected yield components in 2014/2015, apart from average fruit weight and return bloom.
- Taxon
- ‘Smith’ pear treest0
- Treatment
- P-Ca applicationse0
- Outcome
- yield componentse0
- Direction
- positively affectede0
- Qualifier
- except average fruit weight and return bloome0
Not reportedComparator
Verbatim
t0“‘Smith’ pear trees”
e0“In 2014/2015 season, P-Ca applications positively affected yield components, except average fruit weight and return bloom.”
Claim · model-written summary
P-Ca did not positively affect average fruit weight in 2014/2015.
Not reportedComparatorDirection
Verbatim
t0“‘Smith’ pear trees”
e0“In 2014/2015 season, P-Ca applications positively affected yield components, except average fruit weight and return bloom.”
Claim · model-written summary
P-Ca did not positively affect return bloom in 2014/2015.
Not reportedComparatorDirection
Verbatim
t0“‘Smith’ pear trees”
e0“In 2014/2015 season, P-Ca applications positively affected yield components, except average fruit weight and return bloom.”
Claim · model-written summary
P-Ca did not change fruit qualitative attributes at harvest or after cold storage.
- Taxon
- ‘Smith’ pear treese0
- Treatment
- P-Ca applicationse0
- Outcome
- qualitative attributes of the fruitse0
- Direction
- did not altere0
- Qualifier
- at harvest and after a period of cold storagee0
Not reportedComparator
Verbatim
e0“P-Ca applications did not alter the qualitative attributes of the fruits of ‘Smith’ pear trees at harvest and after a period of cold storage.”
Claim · model-written summary
The authors propose P-Ca to manage Smith pear vigor in southern Brazil.
Verbatim
e0“These results implicate P-Ca as a potential tool to manage vigor of ‘Smith’ pear trees in climatic conditions of southern Brazil.”