Effect of various plant growth substances viz., GA 3 (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 GA 3 50 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 14 th 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.

Jamun (Syzygium cuminii L.) Skeels) is evergreen MPTs (Multipurpose Tree species) widely grown in traditional agroforestry systems (agri-silviculture and agri-horticulture) of India, except very dry areas. It produces excellent nutritious fruits, which contains carbohydrates, dietary fibre, fat, protein, vitamins like B1, B2, B3, B6 and C with trace minerals (calcium, iron, magnesium, phosphorus, potassium and sodium). The seed and bark is used to control dysentery and hyperglycaemia, and in diabetic patients. Leaves of the Jamun are used in strengthening the teeth and gums, whereas fruits used in relief for colic, stomach-ache and enlarged spleen. It may accelerate work towards food security through extra food production from degraded and waste areas. The species is widely used for reclamation of salt affected soils and waterlogged areas. Their contribution in environmental conservation through biomass production and carbon sequestration processes. It also helps in conserving biodiversity in traditional agroforestry systems and natural forest areas.