29
F
resea
r
c
h
B
r
ief ing
F
at bot
h
sampling times. Leaf bladeNwas a bette
r
p
r
edicto
r
t
h
an petioleN in p
r
edictingYAN usingdata sets f
r
ombot
h
t
h
e
pot-in-pot vineya
r
d and comme
r
cial vineya
r
ds. relations
h
ips
between leaf blade andpetiole concent
r
ations of P andK and
vine
r
esponse va
r
iables gene
r
ally did not diffe
r
, andbot
h
tissues appea
r
ed tobe equally effective in p
r
edictingP andK
effects on g
r
owt
h
, yield, andmust P o
r
K levels.
Alt
h
oug
h
petiolePwas slig
h
tly bette
r
t
h
an leaf bladeP at
bloom in p
r
edictingmust P levels, andmodels simultaneously
includingbot
h
leaf andpetioleK as p
r
edicto
r
s
r
elied only on
leaf K. Fo
r
all t
hr
ee nut
r
ients, sampling at bloom and ve
r
aison
h
ad a simila
r
p
r
edictive st
r
engt
h
fo
r
r
esponse va
r
iables. Based
on t
h
ese findings, it is
r
ecommended t
h
at leaf blades a
r
e used
todiagnose t
h
eN, P, andK status of Pinot Noi
r
.
ThE FrUITGrOWEr •
MArCh 2017
ef
r
uitg
r
owe
r
.co.uk
T
h
e use of 1-MCP andCAdu
r
ing conditioning of honeyc
r
isp apples
honeyc
r
isp apples a
r
e susceptible todeveloping t
h
e
p
h
ysiological diso
r
de
r
bitte
r
pit and a
r
e sensitive to c
h
illing.
F
r
uit is typically
h
eld at 10 to 20C afte
r
h
a
r
vest fo
r
up to
seven days to
r
educe c
h
illing inju
r
y du
r
ing subsequent cold
sto
r
age. T
h
is tempe
r
atu
r
e
conditioningpe
r
iod, followedby a
lowe
r
sto
r
age tempe
r
atu
r
e (2 to 4C)
r
educes t
h
e
r
isk of c
h
illing inju
r
y but
can exace
r
bate t
h
e development of
bitte
r
pit. Studieswe
r
e conducted
inWas
h
ingtonState to evaluate t
h
e
efficacy of using cont
r
olled
atmosp
h
e
r
e (CA) sto
r
age and/o
r
1-
MCP tomanage t
h
e development
of bitte
r
pit inhoneyc
r
isp apples
(
HortScience
).
Apples obtained at comme
r
cial
h
a
r
vest, we
r
e
h
eld at 10C fo
r
seven
days and t
h
en cooled to3C. half
t
h
e f
r
uit was exposed to1-MCP on
t
h
e day of
r
eceipt and
h
eld at 10C.
F
r
uitswe
r
e sto
r
ed in ai
r
o
r
CA,
establis
h
ed afte
r
one day at 10C o
r
afte
r
seven days at 10Cplus two
days at 3C. F
r
uit t
r
eatedwit
h
1-
MCP and/o
r
sto
r
ed inCA
developed less bitte
r
pit compa
r
ed
wit
h
unt
r
eated f
r
uit sto
r
ed in ai
r
,
andbitte
r
pit incidencewas lowest
fo
r
f
r
uit t
r
eatedwit
h
1-MCPwit
h
CA establis
h
eddu
r
ing conditioning.
T
h
e development of diffuse fles
h
-
b
r
owning and cavities, t
h
at
sometimes occu
r
s du
r
ingCA
sto
r
age of honeyc
r
isp, was
obse
r
ved in some lots. T
h
e
incidence of t
h
ese diso
r
de
r
swas
not inc
r
easedby establis
h
ingCA
twodays afte
r
h
a
r
vest w
h
en
compa
r
edwit
h
nine days. T
h
e use
of 1-MCP andCA slowed t
h
e
colou
r
-c
h
ange of t
h
e peel, t
h
e loss
of soluble solids content and
tit
r
atable acidity, and
r
educed
et
h
ylene p
r
oduction and t
h
e
r
espi
r
ation
r
ate. T
h
e
r
esults
indicate t
h
e potential fo
r
t
h
e post
h
a
r
vestmanagement of
bitte
r
pit development inhoneyc
r
isp apples by using 1-
MCP and/o
r
CA sto
r
age.
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