Mango cultivars viz Mallika,
Dashehari and Amarpali were planted at a
distance of 3 x 3 m as high density orchard
in an area of about 0.4 ha at experimental
farm of Regional Horticultural Research
Station, Dhaulakuan, district Sirmour, HP
during the year 1997-98. There were seven
rows of each variety comprising 21 plants
in each row. The orchard started bearing
fruits during 2003-04. Severe pooled frost
in four spells was experienced in the region
during months of December 2007 to
February 2008 resulting in complete burning
of foliage and twigs. The intensity of frost
was so high that the bud initiation and
differentiation was ceased in the ensuing
spring seasons. The entire mango orchard
gave a dead look. Hence the removal of
dried twigs in a scientific way became
inevitable to get the frost injured mango
trees rejuvenated. For the purpose the
following treatments were applied during
first fortnight of March 2008:
T1 - Head back from first stem
differentiation (Head backed at end
point of main stem)
T2 - Head back from second stem
differentiation
T3 - Head back from third stem
differentiation
T4 - Head back from fourth stem
differentiation
T5 - Tip pruning of frost affected shoots
ie removal of twigs
T6 - Unpruned tree (Control)
The treatments were replicated four
times. Under each cultivar 24 trees were
randomly selected, tagged and the said
treatments were applied during the first
fortnight of March 2008. Pruning treatments
were applied carefully using falco pruning
saw and secateurs to avoid splitting of
stems/branches maintaining smoothness of
cut surface by all means. Cut surfaces of
stems/branches were immediately smeared
with copper oxychloride paste to check
microbial infection and gummosis. Each
treated plant was fertilized with half dose
of urea (1.25 kg), full dose of SSP (3 kg),
MOP (1.5 kg) and well decomposed FYM
(120 kg) which were applied during second
fortnight of June. Irrigation was applied at
15 days interval till the onset of rainy season.
Other cultural practices were followed as
per package of practices of fruit crops.
Data on per cent survival were
recorded during April 2009 wrt branch
length, tree height, average tree spread (east
to west and north to south) during the month
of April 2009, 2010, 2011 and 2012 and
number of fruits set per plant during the
month of May, number of fruit drop per plant
during the month of June, weight per fruit
and fruit yield per plant during first fortnight
of July 2010, 2011 and 2012. Observations
were subjected to statistical analysis as
suggested by Panse and Sukhatame
(1985). Data recorded during the year
2012 for growth and fruit yield parameters
have been presented in result and discussion
part of the manuscript
The centre is situated at 30030’20"
N latitude and 77020’30" E longitude at 470
m elevation in sub-tropical sub-montane
low hill zone of state receiving around 1,600
mm rainfall annually. The centre has three
distinct seasons. There is a dry and windy
season with an average maximum
temperature 370
C and minimum of 80
C
from March to June and rainy season
extends from July to September receiving
around 85-90 per cent of total annual
rainfall. There is a warm period with high
humidity and severe winter with an average
maximum temperature of 240C and the
minimum temperature of -20C associated
with pooled frost from December to
February. The soils are sandy loam alluvial
with pH 6.5-8.0 and organic carbon of
0.45 per cent. The soil fertility is medium
for N and K and high for P.
Mango cultivars viz Mallika,Dashehari and Amarpali were planted at adistance of 3 x 3 m as high density orchardin an area of about 0.4 ha at experimentalfarm of Regional Horticultural ResearchStation, Dhaulakuan, district Sirmour, HPduring the year 1997-98. There were sevenrows of each variety comprising 21 plantsin each row. The orchard started bearingfruits during 2003-04. Severe pooled frostin four spells was experienced in the regionduring months of December 2007 toFebruary 2008 resulting in complete burningof foliage and twigs. The intensity of frostwas so high that the bud initiation anddifferentiation was ceased in the ensuingspring seasons. The entire mango orchardgave a dead look. Hence the removal ofdried twigs in a scientific way becameinevitable to get the frost injured mangotrees rejuvenated. For the purpose thefollowing treatments were applied duringfirst fortnight of March 2008:T1 - Head back from first stemdifferentiation (Head backed at endpoint of main stem)T2 - Head back from second stemdifferentiationT3 - Head back from third stemdifferentiationT4 - Head back from fourth stemdifferentiationT5 - Tip pruning of frost affected shootsie removal of twigsT6 - Unpruned tree (Control)The treatments were replicated fourtimes. Under each cultivar 24 trees wererandomly selected, tagged and the saidtreatments were applied during the firstfortnight of March 2008. Pruning treatmentswere applied carefully using falco pruningsaw and secateurs to avoid splitting ofstems/branches maintaining smoothness ofcut surface by all means. Cut surfaces ofstems/branches were immediately smearedwith copper oxychloride paste to checkmicrobial infection and gummosis. Eachtreated plant was fertilized with half doseof urea (1.25 kg), full dose of SSP (3 kg),MOP (1.5 kg) and well decomposed FYM(120 kg) which were applied during secondfortnight of June. Irrigation was applied at15 days interval till the onset of rainy season.Other cultural practices were followed asper package of practices of fruit crops.Data on per cent survival wererecorded during April 2009 wrt branchlength, tree height, average tree spread (eastto west and north to south) during the monthof April 2009, 2010, 2011 and 2012 andnumber of fruits set per plant during themonth of May, number of fruit drop per plantduring the month of June, weight per fruitand fruit yield per plant during first fortnightof July 2010, 2011 and 2012. Observationswere subjected to statistical analysis assuggested by Panse and Sukhatame(1985). Data recorded during the year2012 for growth and fruit yield parametershave been presented in result and discussionpart of the manuscriptThe centre is situated at 30030’20"N latitude and 77020’30" E longitude at 470m elevation in sub-tropical sub-montanelow hill zone of state receiving around 1,600mm rainfall annually. The centre has threedistinct seasons. There is a dry and windyseason with an average maximumtemperature 370 C and minimum of 80 Cfrom March to June and rainy seasonextends from July to September receivingaround 85-90 per cent of total annualrainfall. There is a warm period with highhumidity and severe winter with an averagemaximum temperature of 240C and theminimum temperature of -20C associatedwith pooled frost from December toFebruary. The soils are sandy loam alluvialwith pH 6.5-8.0 and organic carbon of0.45 per cent. The soil fertility is mediumfor N and K and high for P.
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