STUDIES ON EFFECT OF PACLOBUTRAZOL ON GROWTH AND YIELD OF JAMUN (SyzygiumcuminiSkeels) cv. CHINTAMANI
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Date
2017-06
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University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bengaluru).
Abstract
Jamun (Syzygium cumini Skeels.) is an important minor indigenous fruit of India
belonging to the family Myrtaceae. Jamun cultivation is constrained with the problem of
irregular bearing which leads to considerable loss of their production potential. Paclobutrazol, a
triazole derivative, has been effectively used to induce and manipulate flowering, fruiting and
tree vigor in several perennial fruit crops. An investigation was taken up at Regional
Horticultural Research and Extension Centre (RHREC), University of Horticultural Sciences
campus, Gandhi Krishi Vignana Kendra, Bengaluru, during 2015-16 to exploit the possibility of
regularizing the flowering using paclobutrazol (PBZ). The six year old grafted plants of jamun cv
Chintamani were applied with 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 g a.i of PBZ per plant through soil.
The control plants did not receive PBZ treatment. The application of PBZ at 3.0 g a.i./ plant
resulted less increment in plant height (23.67cm) and canopy spread in N-S (38.50 cm) & E-W
(50.83 cm) direction, 2.5g a.i/ plant resulted in highest number (424) of panicles per plant,
number of flowers per panicle (51.33) and length of flowering panicle (16.16 cm), fruit weight
12.20 g, fruit length 26.20 mm and seed weight 2.30 g. The study revealed that PBZ at 1.5 g a.i/
plant resulted in highest number (292) of new flushes per plant which ultimately led to highest
fruit number (4217) and fruit yield per plant (47.13 kg). Application of paclobutrazol at 3.0 g
a.i./ plant resulted in highest total sugar (8.14 %), antioxidant (268.53 mg/ 100g) and phenol
(2.96 g/ 100g). The use of PBZ holds ample promise for regularizing bearing pattern and
increasing the yield and quality to achieve maximum profit in jamun.