Int.J.Curr.Microbiol.App.Sci (2017) 6(10): 3504-3508 3504 Original Research Article https://doi.org/10.20546/ijcmas.2017.610.413 Influence of Pre Harvest and Pre Flower Sprays of Gibberellic acid, Napthalene acetic acid and Ethrel on Flowering Behaviour, Fruit Yield of Phalsa Cultivar Purple Round under Jammu- Sub Tropics Kunzang Lamo * , Deep Ji Bhat, V.K. Wali, Parshant Bakshi, Amit Jasrotia and Gagan Mehta Department of Fruit Science, Skuast, Jammu, India *Corresponding author ABSTRACT Introduction Phalsa (Grewia asiatica L.) belongs to family Tiliaceae. The phalsa is indigenous to Indian sub-continent and South-East Asia (Chundawat and Singh, 1980). Phalsa is found in wild form all along the foothills of Himalayas. There are 18 genera and 400 species which are mostly distributed in tropical and sub-tropical regions of the world. The genus Grewia has 140 species, out of which 40 occur in India. Phalsa is sub-tropical fruit plant, flowering starts from February- March. Phalsa bear flowers on current year growth in the axil of the leaves and the dehiscence of anther takes place before the flowers are completely open (Godara, 1985). There are three to seven peduncles and each peduncle has three to six flowers of yellow colour. Phalsa is self-compatible, but pollens are not able to reach the stigma to effect the self-pollination due to detraction of stamens away from the stigma causes low fruit set (Randhawa and Dass, 1962). Phalsa fruit ripe in second fortnight of April and continue upto middle of June. Ripe berry contain 50-60 % juice, 10-11 % sugar and 2.0-2.5 % acid, 14.4 % carbohydrates, 1.5 % protein, 0.9 % fat, 129 mg/100g of pulp, 89 mg phosphorous, 3.1 mg iron, 22 mg/100 g of pulp vitamin C and 49 IU vitamin (Aykroyd, 1963). The fruit is non climacteric with extremely short shelf International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 6 Number 10 (2017) pp. 3504-3508 Journal homepage: http://www.ijcmas.com The experiment was conducted at Rainfed Research Sub-Station for Subtropical Fruits (RRSS) Raya, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, during 2015-2016 in Randomized Block Design with three replications and ten treatments; T 1 – 100 ppm GA 3 , T 2 - 150 ppm GA 3 , T 3 - 200 ppm GA 3 , T 4 - 100 ppm NAA, T 5 -150 ppm NAA, T 6 -200 ppm NAA, T 7 - 750 ppm Ethrel, T 8 - 1000 ppm Ethrel, T 9 - 1250 ppm Ethrel and T 10 - control (water spray). Flowering behaviour like date of flower initiation, date of end of flowering, duration of flowering, average number of flowers per shoot and fruit yield were observed during the investigation. Pre flowering and pre harvest spray of 1250 ppm or 1000 ppm ethrel resulted in early flowering i.e. on 18 th March while untreated bushes were last to initiate flowering i.e. on 25 th March. Ethrel 1250 ppm resulted into early end date of flowering i.e. on 21 st April. GA 3 150 ppm resulted in maximum average number of flowers and fruit yield in phalsa. Keywords Phalsa, Purple Round, Plant growth regulators, Flowering behavior and yield. Accepted: 28 September 2017 Available Online: 10 October 2017 Article Info