REDUCING OF SWEET ORANGE SUMMER FRUIT DROP BY GROWTH REGULATORS

SWEETY¹*, G.S. RANA², G. CHANDRAMOHAN REDDY^3
1Department of Horticulture, College of Agriculture, CCS Haryana Agricultural University, Hisar, 125004, Haryana, India
²Department of Horticulture, College of Agriculture, CCS Haryana Agricultural University, Hisar, 125004, Haryana, India
³Department of Horticulture, College of Agriculture, CCS Haryana Agricultural University, Hisar, 125004, Haryana, India
* Corresponding Author : nirolsweety9101992@gmail.com

Received : 01-12-2018     Accepted : 12-12-2018     Published : 15-12-2018
Volume : 10     Issue : 23       Pages : 7593 - 7594
Int J Agr Sci 10.23 (2018):7593-7594

Keywords : Fruit drop, growth regulators, Fruit yield
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to College of Agriculture, CCS Haryana Agricultural University, Hisar, 125004, Haryana, India
Author Contribution : All authors equally contributed

Summer fruit drop (May to August) is one of the main reasons for low yield in some citrus varieties in northern India. Recognition of physiological changes in fruit abscission zone (calyx) and application of suitable treatments would reduce abscission. Hence, the present study was undertaken, with the following objective, to determine the effect of growth regulators on yield and quality of sweet orange cultivar Jaffa. A randomized complete block design (RCBD) experiment was performed with 10 treatments and 4 replicates. Treatments were as follows: (T1) GA3 10 ppm, (T2) GA3 20 ppm, (T3) GA3 30 ppm, (T4) 2,4-D 5ppm, (T5) 2,4-D 10 ppm, (T6) 2,4-D 15 ppm, (T7) NAA 20 ppm (T8) NAA 30 ppm (T9) NAA 40 ppm and (T10) (control) i.e. water spray. There were two spray schedules i.e. last week of March and first week of July). Results showed that abscission had a significant negative correlation with auxin concentration and a significant positive correlation with control treatments. The maximum reduction of fruit drop from May to harvesting and percent fruit retention was recorded with the treatment NAA 20 ppm followed by 2,4D 10ppm. But all growth hormones significantly reducing the fruit drop than control. Therefore, using of growth regulatorsan appropriate concentration can be balance physiological metabolism and reduce fruitlets abscission.

1. Young (1929) Frost and prevention of frost damage”, US Deptt. Agriculture farmer bull. 1588, (62).
2. Huchche A.D. (2001) Nature and management of citrus fruit drop. In: Citrus (Eds., Singh, S. and Naqvi, S.A.M.H.). IBDC Publishers. Lucknow, UP.287-294.
3. Amiri N.A, Kangarshahi A.A, Arzani K. (2012) Int. J. of Agri. and Crop Sci., 22(4),1720-1724.
4. Dhaliwal H.S., Rattanpal H.S., Anita, Arora N. (2009) J. of Res. Punjab Agriculture University, 46(3-4),163-65.
5. Gurjar P.S., Rana G.S. (2014) Indian J. of Horti., 71(1),109-111.
6. Hussain Z, Sivla J.A., Nawaz T.D., Afzal M.A., Ahmed M., Ashraf M. (2011) The Asian and Australasian J. of Plant Sci. and Biotech., 5(1),17-21.
7. Sharma M.K., Chaudhary H.D., Jain M.C., Bhatnagar P. (2013) The Asian J. of Horti., 8,746-750.
8. Shweta U. and Misra, K.K. (2015) Indian J. of Hortic., 71(1), 126-129
9. El-Kobbia, A.M., Kassem, H.A., Marzouk, H.A. and Abo-Elmagd, M., (2011) Emirates J. of Food and Agri., 23(1), 95-102.
10. Tamer S., Yıldırıma B., lua T.Y.I., Ncesua M.I., lub M.C.K. and Imena B.C. (2012) New Zealand J. of Crop and Horticultural Science, 40(1), 55-64.
11. Saleem M, Ashraf Y.M., Ashraf M., Akhtar M., Mahmood K. (2013) Pakistan J. of Botany, 45,433-440.