Journal of Applied and Natural Science 6 (1): 286-289 (2014)
Effect of foliar application of GA3, ethrel and copper sulphate on flowering
behaviour and sex ratio of Jatropha curcas L.
Paresh Gayakvad*, D.B. Jadeja and S. Bhalawe
Department of Silviculture and Agroforestry, ASPEE College of Horticulture and Forestry, Navsari Agricultural
University, Dandi Road, Navsari-396450 (Gujarat) INDIA
*Corresponding author. E-mail: firstname.lastname@example.org
Abstract : Effect of various plant growth substances viz., GA3 (25, 50,100 ppm), ethrel (1500, 2000, 2500 ppm),
copper sulphate (0.1, 0.2, 0.5%) as foliar spray treatment applied during January to October was studied at 15 days
intervals. The flowering behaviour and sex-expression of Jatropha curcas was investigated during in randomized
block design (RBD) at the College Farm, Navsari. Looking to the results, it was noticed that GA350 ppm resulted in
increased number of inflorescence per plant (31.25), number of flower per inflorescence (76.87), number of (male
94.75/female 4.01) flowers, flower sex ratio (24.22) in J. curcas. The Male: Female flower ratio was the lowest at
14th spray stage under majority of treatments indicating increased number of female flowers which is ultimately reflected
by increased fruit and seed yield of J. curcas.
Keywords : Flowering and male/female ratio, J. curcas, Plant growth regulators