REJUVENATION STUDIES ON GROWTH, FRUITING AND FRUIT QUALITY OF APRICOT (Prunus armeniacaL.) cv. New Castle
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Date
2014
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UHF,NAUNI
Abstract
ABSTRACT
The study entitled “Rejuvenation studies on growth,fruiting and fruit quality of apricot
(Prunus armeniacaL.) cv. New Castle” was conducted on 25- years oldrejuvenated trees of New
Castle apricot in the experimental orchard of the Department of Fruit Science, Dr. Y S Parmar
University of Horticulture and Forestry, Nauni, Solan (H.P.) during 2013 and 2014. These
experimental trees were given rejuvenation treatments (combination of 3 pruning severities and 3
levels of nitrogen) in the year 2011. The standard pruning was practiced afterwards but the
combinations of different level of nitrogen in the experimental trees were applied. To ascertain
the effect of rejuvenation treatment on tree vigour , fruiting, and productivity the study was further
continued for another 2 years i.e. 2013 and 2014. T he experiment was laid out using Randomized
Block Design consisting of 10 treatments replicatedthrice. The experiment comprised factorial
combination of pruning severities (20%, 40%, 60% and heading back of main scaffolds) and,
three levels of nitrogen (500, 625 and 750 g/tree). In all there were nine combinations of pruning
intensities and nitrogen level treatments which wer e compared with control. The results revealed
that maximum annual shoot growth (167.06 cm), tree spread (4.63cm), pruning wood weight
(9.19kg/tree), leaf area (36.15cm
2
), leaf chlorophyll contents (2.62mg/100g) and foli ar N
(2.97%), Fe (248.26ppm), Mn (158.19ppm) and Zn (11. 77ppm) contents were higher in T
9 (60%
heading back of scaffolds+750g Nitrogen). The various physico-chemical parameters such as
fruit weight (26.59g), fruit volume (22.91cc), TSS (15.99
0
B), total sugar (9.84%), reducing sugar
(3.70%), non-reducing sugar (6.61%), acidity (1.91% ) and fruit firmness (5.40kg/cm
2
) were
highest in T
7 (60% heading back of scaffolds+500g Nitrogen), whi le foliar P (0.247%), Ca
(3.07%), Mg (0.92%) and Cu (14.56ppm) contents were higher in T1 (20% heading back of
scaffolds+500g Nitrogen) in New Castle apricot under study.
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