Carrot physiological disorders By Mr. Allah Dad Khan Provincial Coordinator IPM KPK MINFAL Islamabad

1. Carrot Physiological Disorders

2. Carrotb Physiological
Disorders
ToT to FFS Staff
By Mr. Allah Dad Khan
Provincial Coordinator IPM KPK
MINFAL

3. Identification
 Carrot (Daucus carota). The large taproots of
this European herb are one of the most popular
vegetables in North America. Like other biennial
herbs, carrots store up food reserves in the main
taproot during the first summer of growth, and
then flower and die the following year. Carrots
are typically harvested by the end of their first
growing season. Wild flowering carrots are called
Queen Anne's Lace, supposedly named after
Queen Anne of England (1665-1714). Queen
Anne apparently won an embroidery contest to
see who could produce lace as beautiful as the
intricate clusters of tiny white flowers of the wild
carrot. Carrot roots are rich in the tetraterpene
beta-carotene (C40H56), the precursor of the
anti-oxidant vitamin A (C20H30O). During
digestion, each beta-carotene molecule is broken
down into two molecules of vitamin A. Vitamin A
is also called retinol because it is almost identical
to the retinol present in the rod cells of the retina
of human eyes. Rod cells are sensitive to light
and enable one to see at dusk and in dimly
illuminated areas
Carrot

4.  NitrogenDeficiency
SymptomsThe Number
and size of leaves were
reduced and pale green
colour of leaves change
to yellow roots because
thin, stiff and fibrous.
 Correction
MeasureFoliar spray of
urea @1%

5. Symptoms
 Growth dwarfed
and thin; leaves
pale green and
older leaves yellow
and red tints and
die off early
Carrot Plants Nitrogen deficiency

6. Symptoms
 Growth dwarfed
and thin; older
leaves strong purple
tints and die off
early
Carrot Plants Phosphorus deficiency

7.  PotassiumDeficiency
SymptomsLeaf colour
change to pale yellow
and brown scorches
appear at laber stages.
Violet streaks appear on
roots. Growth in
retarded.
 Correction
MeasureFoliar spray of
KCl@1%

8.  PhosphorusDeficiency
SymptomsPlants were
shorter, smaller leaves,
distorted in shape and pink
tinge appear along margin
and veins. Formation of
shortage root delayed.
 Correction MeasureSoil
application of
recommended dose of
Phosphorous fertilizer

9.  CalciumDeficiency
SymptomsSymptoms
are marked on younger
plant parts. Leaves
become chlorotic fever
and roots are smaller.
 Correction
MeasureFoliar spray
of CaCl2@0.5-1.0%

10. Symptoms
 Petioles collapse
and leaves wither
Carrot Plants Calcium deficiency

11. Symptoms
 Older leaves
strongly chlorotic.
Carrot Plants Magnesium deficiency

12.  MagnesiumDeficienc
y SymptomsChlorotic
on nature leaves. Which
later abscise and fall off.
The roots are smaller in
size, stiff and pale in
colour.
 Correction
MeasureFoliar spray of
MgSO4@0.5-1.0%

13. Symptoms
 Growth squat and
leaves curl
backward; leaflets
of older leaves
develop marginal
scorch, followed by
general browning
and collapse
Carrot Plants Potassium deficiency

14. Symptoms
 Growth of young
leaves restricted
giving a rosette
effect, older leaves
orange tints;
growing point may
die.
Boron
Deficiency
Symptoms
Crinkling of
leaves; carrot
size become
smaller
Correction
Measure
Foliar spray of
borax@0.5%
Carrot Plants Boron deficiency

15.  BoronDeficiency
SymptomsCrinkling
of leaves; carrot size
become smaller
 Correction
MeasureFoliar spray
of borax@0.5%

16.  IronDeficiency
SymptomsChlorosis
on younger leaves.
Storage roots were
reduced in size and
become pale in colour.
 Correction
MeasureFoliar spray
of FeSO4@0.5%

17.  ZincDeficiency
SymptomsYoyng
leaves become smaller
i.e. little leaf
symptoms. and become
yellow in color
 Correction
MeasureFoliar spray
of ZnSO4@0.5%

18.  SulphurDeficiency
SymptomsChlorosis
occur in young leaves
 Correction
MeasureFoliar spray
of CaSO4@05.%

19.  Name of disorder: Root splitting
Crop: Carrot
Splitting or cracking of carrot roots is a major problem in many carrot growing
areas. It is reported that this tendency towards is controlled by genetic factors but a
number of other factors are also involved.
 As clear by its name, roots get splitted making it unfit for market.
 Earlier cultivars split more readily than late ones (Moravec, 1961).
 In soils with high content of N, splitting of roots is increased. High soil
concentrations of ammonium compounds caused more serious splitting than by
other forms of nitrogen. Heavy side-dressings with NH4NO3 when the roots were
6.5 cm in diameter increased splitting, especially when nitrogen applied to widely
spaced roots.
 Wider the spacing, the greater chance of splitting
 If roots are large, there are chances of splitting as compared to small ones.
 Control/ Management
Follow proper management practices like right spacing and optimum amount of N
application.
 Prefer other forms of N fertilizer source than ammonium compounds.

20.  Name of disorder: Cavity spot
Crop: CarrotSymptoms:This disorder appears as a cavity
in the cortex, in most cases the subtending epidermis collapses to from a
pitted lesion. Reasons:
The cavity spot disorder is induced by deficiency of Ca.
 This is associated with an increased accumulation of K which leads to a
decreased accumulation of Ca.
 Maynard et.al., 1963 reported that the cavity spot disorder of carrot roots is
a manifestation of Ca deficiency, which may be induced by excess K uptake
during the ontogeny of carrot plants.
 Control:
Increase in Ca level in the growing medium leads to significant reduction in
the incidence of cavity spot.
 Jakobsen and Jorgensen (1986) suggested that application of fertilizer
should be kept minimum and only be done in spring or early summer when
the crop requires it the most .This would avoid a build up of K in the plant.