Data/hora: 03/06/2024 18:27:16

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - A
Data corrente: | 13/07/2016
Data da última atualização: | 13/07/2016
Autoria: | CARRA, B.; PASA, M. S.; FACHINELLO, J. C.; SPAGNOL, D.; ABREU, É. S.; GIOVANAZ, M. A.
Título: | Prohexadione calcium affects shoot growth, but not yield components, of ?Le Conte? pear in warm-winter climate conditions.
Ano de publicação: | 2016
Fonte/Imprenta: | Scientia Horticulturae, Amsterdam, v. 209, p. 241-248, 2016.
Idioma: | Inglês

Conteúdo:

Different  studies  describing  Prohexadione  calcium  (P-Ca)  as  an  efficient  tool  to  reduce  shoot  growth  have
been  extensively  reported,  but  these  studies  are  usually  performed  in  typical  temperate  climate  regions.
However,  a  complete  analysis  of  the  effects  of  P-Ca  in  pear  trees  in  regions  of  warm-winter  climates  has
not  been  performed.  Therefore,  the  objective  of  this  study  was  to  evaluate  the  effect  of  different  rates  of
P-Ca  on  vegetative  growth,  production  and  fruit  quality  of  ?Le  Conte?  pear  trees,  in  warm-winter  climate
conditions.  The  experiment  was  conducted  during  the  2013/2014  and  2014/2015  seasons,  in  a  six  year  old
?Le  Conte?  pear  orchard,  trained  to  a  central-leader  system,  with  spacing  of  1.5  ×  4.8  m,  grafted  onto  Pyrus
calleryana.  Different  P-Ca  rates  were  applied  (100,  200,  300,  400  mg  L
&#8722;1 )  in  different  biological  stages: first  in  early  spring  (shoots  &#8764;2.5  and  5  cm  long)  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.  Shoot  length  was  measured  on  10  one-year-old
shoots  evenly  selected  and  tagged  at  the  time  of  the  first  application  and,  then,  at  biweekly  intervals
until  the  end  of  the  season.  The  use  of  P-Ca  was  effective  to  control  vegetative  growth  in  both  seasons,
at  different  rates.  At  &#8764;90  days  after  full  bloom  (DAFB),  P-Ca  treated  shoots  had  a  pronounced  second
flush  of  growth,  requiring  an  additional  application  of  P-Ca  in  both  seasons.  In  the  2013/2014  season,  the
only  time  of  P-Ca  reapplication  was  at  93  DAFB  for  the  rates  of  100  and  200  mg  L
&#8722;1 ,  which  was  enough to  check  shoot  growth  throughout  the  season,  but  in  the  2014/2015  season,  three  shoot  growth  flushes
were  observed  according  to  P-Ca  rate,  requiring  additional  P-Ca  applications.  Unlike  the  first  season,
P-Ca  reapplication  was  efficient  to  reduce  shoot  length  relative  to  trees  treated  once  with  P-Ca.  In  both
seasons,  fruit  set,  number  of  fruits  per  tree,  yield,  average  fruit  weight,  fruit  diameter,  estimated  yield,
return  bloom,  and  return  yield  were  not  affected  by  P-Ca  applications.  P-Ca  applications  did  not  alter  the
qualitative  attributes  of  the  fruits  of  ?Le  Conte?  pear  trees  at  harvest  and  when  they  were  stored  for  a  period
of  30  days  of  regular  air  cold  storage  (RACS)  +  3  days  of  ripening  period  (RP)  in  both  seasons.  These  results
implicate  P-Ca  as  a  potential  tool  to  manage  vigor  of  ?Le  Conte?  pear  trees  in  warm-winter  conditions,
given  its  efficiency  to  control  vegetative  growth  without  negatively  affecting  yield  components.

Palavras-Chave: | Fruit quality; Plant growth regulators; Pyrus sp; Return yield; Vigor.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_38075.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (100270-1) - UPC - AP - DD -  -  -  - DIS