_____________________________________________________________________________________________________ *Corresponding author: E-mail: jrajangam2016@gmail.com; International Research Journal of Pure & Applied Chemistry 20(1): 1-6, 2019; Article no.IRJPAC.52031 ISSN: 2231-3443, NLM ID: 101647669 Effect of Paclobutrazol and NAA Application on Yield Attributing Characters of Jamun (Syzygium cuminii Skeels.) V. Deepika 1 , J. Rajangam 2* , V. Swaminathan 3 , K. Venkatesan 4 and D. Janaki 5 1 Department of Fruit Science, Horticultural College and Research Institute, Coimbatore, Tamil Nadu, India. 2 Department of Fruit Science, Horticultural College and Research Institute, Periyakulam, Tamil Nadu, India. 3 Department of Horticulture, Agricultural College and Research Institute, Madurai, Tamil Nadu, India. 4 Department of Floriculture and Medicinal Crops, Horticulture College and Research Institute, Periyakulam, Tamil Nadu, India. 5 Department of Natural Resource Management, Horticultural College and Research Institute, Periyakulam, Tamil Nadu, India. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/IRJPAC/2019/v20i130127 Editor(s): (1) Dr. Wolfgang Linert, Professor, Institute of Applied Synthetic Chemistry, Vienna University of Technology Getreidemarkt, Austria. Reviewers: (1) R. Mahalakshmi, India. (2) Girlaine Pereira Oliveira, Escola Superior de Agricultura “Luiz de Queiroz”, Brazil. Complete Peer review History: http://www.sdiarticle4.com/review-history/52031 Received 30 July 2019 Accepted 03 October 2019 Published 14 October 2019 ABSTRACT Jamun (Syzygium cuminii Skeels.) is the medicinally important indigenous fruit tree of India belongs to the Myrtaceae family. The antidiabietic properties of Jamun brought higher market demand which stimulates to increase the fruit production and also brought the off season concept for commercial exploitation by paclobutrazol application. An investigation was carried out to study the effect of paclobutrazol and NAA application on yield attributing characters of nine years old jamun trees during 2017-18. The various treatment combinations are paclobutrazol (PBZ - 0, 0.50, 1.0 and 1.5 g a.i. m -1 of canopy diameter) and foliar spray of NAA (0, 50 ppm, 75 ppm and 100 ppm) application at Original Research Article